Collage with 2 sets of content

I preface this with the fact that I am fairly inexperienced with the DL-2/DL-3 product line.

What I am trying to do is the following.

I have (6) DL-2 units and I am making a collage that is projecting on a surface. My client wants to have basically 66% of the collage one thing and 33% another thing all on the same surface. I have the collage arrayed in a 3x2 format. The question is what is the best way to blend from 2 units stacked vertically to go horizontally to another 2 units with a different collage? Do I want to do two separate collages a 1x2 and a 2x2? How can I soften the edges where the media blends?

Does this make sense and am I crazy for trying this?