Review on White Universal Projector Ceiling Mount with 25.6 inches Extension Pole - Holds up to 44 lbs (PM-001-WHT): Multiple Adjustment Bracket for Optimal Viewing Experience by Andrew Dinelli

The screws holding the projector at an angle are not tight enough. There are no nuts in it. They are just metal threads. They come off very easily. There should be some nuts and bolts here, not just drilled holes with threads. Also: if you mount it on 2x rafters or on the floor, the mounting plate is not square. The holes are at the corners and the bottom bracket is diagonal to the rafter. There's enough flex on the underside to make it work, but it forces you to tighten the screws even more.