You could use a threaded rod connected to a beam clamp to drop the AP 24-36" or more from the ceiling. We use this in many retail and warehouse installations where the ceiling is open and mechanicals are exposed.
The beam clamp fastens the all-thread rod to the ceiling beams or joists, the AP mount is held on by a washer, lock washer and nylon nut to keep it from backing off.
See pics for an idea. This was done with an AP-105 but works as well on any of the current model APs.