Ubiquiti PowerBeam M5 Quick Start Manual page 10

Mounting the PoE Adapter (Optional)
1. Slide the PoE Mounting Bracket down to remove it from the
Gigabit PoE Adapter.
2. Place the PoE Mounting Bracket at the desired location and
mark the two holes. Pre-drill the holes if necessary, and
then secure the bracket using two fasteners (not included).
3. Align the slots of the Gigabit PoE Adapter with the tabs of
the PoE Mounting Bracket, and then slide the adapter down.