Unless you can get the MG's well out into the room then you might need some absorption/diffusion behind them (for the rear reflection). Otherwise treatments will probably be similar (for bass)
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Some of the planar speaker makers wanted the rear wall reflective, Apogee recommended this for my Duetta Sigs. Treating corners and wall interfaces should be the same for both in my experience. The basic Michael Green kit is inexpensive and should work with either. I use RELs in the way you suggest and am happy with results.