Diffusers for magnepan speakers

Looking for thoughts on building a skyline diffuser panel the same size as a maggie 1.6 to place behind speakers. Asking for advice because my online reseach mentioned a 2x2 panel for general specs. i do not want to waste the time and money if it would not sound good. I am thinking about three 2x2 panels placed on stands behind the speakers about 3.5 feet. Any thoughts would be appreciated.