Ubiquiti Networks UniF AP AC - Manual (Page 9)

Ceiling Mount
1. Remove the ceiling tile.
2. Place the Ceiling Backing Plate in the center of the ceiling
tile. Mark the four mounting screw holes and 25 mm hole
for the Ethernet cable feed.
25 mm Hole for Ethernet Cable Feed
3. Use a 3 mm drill bit to drill the screw holes, and cut or drill
the hole for the Ethernet cable feed.