Unifi AC LR custom backpalte

Custom backplate for to replace the stock backplate for the wifi access point Unifi AC LR. Should be compatible with any other Unifi mount.

Differrnces to the stock backplate:
- No latching mechanism: the stock backplate has a latch that is very difficult to release. Therefore I wanted something that made tanking the acces point off the backplate easier.
- Designed to be mounted with Tesa powerstirps (Large, [example here](http://www.tesa.com/consumer/mounting-hanging-sms/adhesive-strip-pow