I have a customer with a 24 foot long by 15 foot wide boardroom. They want to mount the projector from the rear wall. After reseaching it seems to not be a problem as long as I get a bigger screen. The picture will not be able to fit the screen perfectly but it will fit "in" the screen. My question is, does the top of the lens have to be the same height as the top of the screen? Or can I angle the projector down? By the way the projector is an LP335 Infocus with the possiblity that they will buy an LP280, same specs. Also what would be the best way to blanket the room with IR receivers, wall or ceiling mount and how many? Thanks for any help?