Where to hang Bluebird feeder
To be honest, to feed Bluebirds would mean feeding all visiting species, though it can help to encourage Bluebirds when their conditions are met.
Where to hang Bluebird feeders will be on a bird feeder pole along side suspended feeders for everyone else. Bluebirds can be feeder-shy, yet readily come to an open to all suspended bird feeder tray/dish, which must be hung in the sunshine, which will preferably see feeders suspended over an open lawn.
I would avoid a tree branch or hanging a Bluebird intended mealworm-filled bird feeder in shrubs/bushes for now, because the best way to attract Bluebirds to your yard, is by grouping bird feeders on a centrally located lawn, bird feeder pole.
Any bracket will do, yet to isolate what will be a tray full of dried or live mealworms, would normally need the space on one side of the pole.
That's OK though, as Bluebirds or perhaps other insect-eating birds will prefer the room.
How high to hang a Bluebird specific bird feeder, would be much like any suspended bird feeder, with a safe 4-6 feet distance off the ground to keep predators and pests out of reach of vulnerable feeding wild birds.
I can't emphasis the need to hang all Bluebird feeders in a well lit up area, because by nature, Bluebirds like to forage in the sunshine.
Ordinary, a ground feeding bird like a Bluebird would flutter down to the lawn, to pick up a mix of insects or bugs like spiders and earthworms.
Its not as straight forward with Bluebirds, as their behavior will see them hovering down to the ground to pick up food, rather than land fully. Sure, Bluebirds can eat off ground bird feeders, but its rare - thus its vitally important to make hanging bird feeders accessible to less willing Bluebirds.
How to feed Bluebirds must be on an accessible but highly visible open dish bird feeder, which must preferably be over a lawn in a well lit up area.
Bluebirds less able on hung feeders
With the idea of Eastern or Western Bluebirds coming to bird feeders suspended on a confined bird feeder, this is unthinkable to most of us as we aren't all lucky enough to be able to see Bluebirds to come to an unfamiliar place to forage.
Given the right circumstances, you can get wild birds like Bluebirds to feed off an hanging, but open to all bird feeder in time.
Where you hang Bluebird feeders - which is primarily mealworm-filled dishes - would be on a regular bird feeder pole, or a separate wall or fence bracket.
Personally, I hang a variety of bird feeders on a ready to go bird feeding station pole, then all I have to do is wait and see.
Attracting Bluebirds to a hanging bird feeder isn't much different than attracting a mix of wild birds to feeders; you must provide a variety of bird feeders along with varied bird feed, which is mostly designed to attract fruit and/or seed eating birds.
Essentially, you can really only feed Bluebirds on dried or live mealworms, of which the best way to feed Bluebirds mealworms is in a suspended bird feeder tray. If its a deep tray, then you can insert very tempting live mealworms which are highly attractive.
Make room for Bluebirds
While Bluebirds absolutely do come to bird feeders to eat, they aren't particularly a common bird feeder bird, as their natural foraging behavior surpasses far beyond the needs of a simple suspended bird feeder.
Bluebirds do much of their foraging by fluttering around down on the ground to pick up insects on the ground or in mid-air - while all this begins with Bluebirds perching above.
As you can imagine, this behavior isn't anything like feeding off a regular bird feeder, which usually imitates foraging in trees or natural vegetation.
And while Bluebirds can feed alongside other species, its better to at least set your bird feeders up in a certain way, where potentially a Bluebird specific feeder is secluded.
Let's take a suspended bird feeder tray/dish, that normally hangs off a chain.
I would still suspend this tray off the bird feeder pole along with other types of bird feeders; only I would reserve one side of the pole for the mealworm-filled dish. Really, this is the best way to feed dried mealworms to all insect-eating birds - as the tray often requires additional space around it.
No need to go out of your way to hang a dish/tray out of the away from the current crop of hanging bird feeders, as it risks being unseen, and therefore not used at all.
Situate BLUE feeders on pole
Where to hang Bluebird feeders must really be on the classic bird feeding station pole, or the similar Shepherd's Hook in the end.
People usually make an exception for placing a bird feeder pole, of which would normally see it situated in the best place in the yard.
Well, this same area would normally be where Bluebirds like to visit a feeder, so the pole is where to place the Bluebird feeder.
What Bluebirds eat at feeders will mostly be dried/live mealworms, along with fruit/insect suet fat balls or suet cakes - plus a mix of fresh or old fruits put out in a dish.
What kind of feeders do Bluebirds like most are really those that are easy to access bird feeder trays, which can hang or be mounted.
Bluebirds don't really eat seeds or peanuts within small, compact feeders. Its therefore safe to say Bluebirds don't really like to eat at feeders that force them into an awkward angle.
That is why you'll see all the Bluebird family members - not all but most of them - come to suspended bird feeder trays/dishes, which is where they bring their young to hopefully feed them on mealworms.
Sunshine guarantee its found
How you attract Bluebirds to their feeders which would be exclusively setup for them, would be of course hanging bird feeders in the sunshine.
Get used to that as all bird feeders must be hung or placed under direct sun. To place or hang bird feeders in shade, would possibly see bird feeders go unseen - and therefore unused for the duration of their time left outdoors.
Bluebirds like to flutter down to our lawns to pick up random insects, whilst this behavior i unlikely to carry over to when Bluebirds come to feeders.
What I do know however is that Bluebirds like to feed on large, well lit up lawns, which is where the bird feeder pole must be located.
Sunshine guarantees visibility and thus it would only be a matter of time before said bird feeders are found.
Will Bluebirds use it or not? Well only time will tell. In the meantime, keep the hanging tray full of dried/live mealworms mixed in with some suet pellets or crushed up suet cakes/balls... bird food waste will be low as other species will soon eat it all up.
Conclusion
Where you would hang any kind of Bluebird accessible bird feeder, is alongside other kinds of bird feeders on a bird feeding station pole.
Avoid a tree branch or shrubs for Bluebirds as they have come accustom to at least understanding bird feeders grouped together would mean a food source.
Bluebirds don't have the dexterity at bird feeders as much as other common backyard birds, thus will avoid a too confined bird feeder. Absolutely Bluebirds are capable of feeding on small compact feeders - yet prefer to visit bird feeder trays.
Take a suspended bird feeder tray/dish - the kind with a mesh base for drainage - and hang it along with other types of bird feeders.
The type of bird feeder pole location to attract specifically Bluebirds, would require a pole that is impaled in the sunshine over a brightly lit up lawn.
You can't feed one bird species while offering a different feeder/food to another, thus all Bluebird intended feed, will soon be eaten by others.
What you feed Bluebirds will be mostly dried/live mealworms, with preferably a suspended hanging mealworm feeder avoided - while choosing a wide open, hanging tray which is usually hung with a chain.
Dried mealworms can go in this tray of which you'll find Bluebirds will bring along their fledglings to eat the mealworms they feed to them come spring/summer.