VERY!

It has to be high enough that they can launch themselves into
flight from the doorway.

It has to be away from high-traffic areas.

It has to be in an area that gets enough, but not too much, sun.

And for the homeowner,it has to be in a spot where the guano is
not going to be a problem.

Now therein is the issue -- to hear some talk, these things can be as close
to the ground as 7-8 feet and they'll still be occupied. It's a curious
thing.

James