This Reolink Drop Ceiling Mount Backing Support designed to strengthen the mount for Reolink Security Cameras being attached to drop ceiling tiles.  Screw holes are 48.5mm apart in a triangle pattern to match Reolink POE cameras like the one shown (many have the same hole pattern).  After drilling a hole for the camera cable to pass through.  Attach the camera mount using screws, but just let the screws break the surface of the ceiling tile.  Then placing this backing support over the screw points and finish tightening the screws.