DL-3 Collage in rear projection

I have a job coming up where we will be using a 3w x 2h DL-3 collage rear projection onto an RP screen. How do I configure the fixtures to handle projecting text properly on the RP? Do I set the PROJECTOR REAR flag on all fixtures -or- do I need to manipulate the content in the fixture to get it to read as intended?

Thanks in advance.

-H