Needed to mount a Hikvision Wireless PIR sensor in a corner, so I made this. Can be used to mount anything with a flat side into a corner.

Features a cable gap in the corner, also acts as a open area to avoid rough surfaces in the deep corner. 

2 versions included, solid and material gaps. 

Stronger than the mount needs to be.
Picture is a older revision.

Your standard print settings would be plenty.