you have to set up and test for yourself.
you may or may not need more than 6 outputs. thats quite small.
blending gets easier the more overlap there is.
there is a lot of projector stuff that needs to be correct-
i have done it myself several times. but it is tricky. and used more than 6 outputs.
playing a movie 3200x480 takes almost all available time on computer. so there is no time left to do live video. and frames get buffered by blackmagic cards.