Recently, the major health concern is the mosquito borne disease triple E.
For some reason it seemed to disappear during the Covid pandemic.

So installing a bat house is a good health decision to

There's a ton of information online on how to build and install a bat house.
Some of it is specific to the region of the country you live in.
If I were to try to utilize a pole, like you're suggesting, I would build a double back to back house, as high as possible and install some type of preditor guard.
Sun exposure and bat house color are important things to consider.
Mine is mounted on my house and being in New England that's a good thing because it helps retain heat.
I'm very lucky and I feel pleased that I got residency in the first couple months .