How do i project moving images at a low level on stage?

Hi!....i was wondering if anyone could help me out – i’m designing the set for a play in which i’d like to use a board of timber behind the actors to project simple moving images onto. i was wondering what the greatest angle on a projector could be to be able to front-project onto the surface which i would suspend only at 1.5m above stage (without projecting onto the actors)! does this require too much technology, and would it mess up the general stage lighting?....