Universal Nest Protect V2 Junction box

This is an universal junction box for the Nest Protect V2.
It was designed to mount a mains powered NP anywhere on the ceiling / wall and provide room for the cabling and connect to cable ducts.
There are two entry / exits points with strain reliefs with breakout hole covers, which allow end or feedthrough cabling.
There are 4 screw holes that allow the unit to be mounted with the original NP screws.
However I used carpet sticky tape to fix the unit onto my ceiling

I used the following ma