All of our wall-mountable IoT projects use a three peg bracket for mounting. These parts are designed to be modular, and can be used interchangably in different ways. The pivot requires a single 15/16" (2,3cm) Screw Eye to tighten.
The Pi webcam/DVR has its three peg holes on the side of the case.
The sensor array fits inside this handy holster for mounting.