Ubiquiti Networks UniF AP - Manual (Page 9)

Ceiling Mount
1. Remove the ceiling tile.
2. Place the Mounting Bracket in the center of the ceiling tile.
Mark the three mounting screw holes and 25 mm (1 in)
hole for the Ethernet cable.
25 mm (1 in) Hole for Ethernet Cable Feed
3. Use a 3 mm (1/8") drill bit to drill the screw holes, and cut or
drill the 25 mm (1 in) hole for the Ethernet cable feed.