I suggest you listen to the spatials first in your room before deciding whether you need room treatment. They don't work like conventional speakers. Almost no sound comes from the side of these speakers and for me, since I toed them in, really little sound actually reaches my first reflection points on the side wall.
After moving the spatials in, my front wall has been changed to a full panel of diffusers, and on the side, and on the back, not much of anything.