For a universal projector mount, please consider the Chief RPA-U. I will admit that I haven't used the specific Peerless mount that you are describing. I have used the Peerless PAG-UNV-HD mount, though.
No matter what I did, there was some play in the setup after projector installation. i.e. whenever I would use the vertical or horizontal lens shift knobs, the projector would move around quite a bit. It would theoretically return to its original position, but was not confidence inspiring. I have recently changed it out for the chief. Very solid mount and I could not be happier.
Just my 0.02.