The UniFi® Video Camera Dome (aka the UVC-Dome) has a series of mounting clips on the back, designed to clip in to their supplied ceiling tile mount.
Use this bracket to mount the camera to other things! A surface mount box this can be screwed in to will be available soon. The bracket in the photo is a slightly older revision - the current one has three mounting points and they're spaced slightly further out from the camera.
Align the longer clip with the longer slot, press down and rotate slightly to lock.