Of course it'll "work", within the inherent limits of the arrangement. As compared to using the M80 mains to carry the center channel material in a "phantom center" setup, placing two M80s(or other speakers)directly alongside the screen for center channel speakers has several effects. The center channel volume can be increased independently of the mains since different speakers are carrying it. The center channel image would be exactly centered for someone directly in the middle between them. As the listener would move to the side, so would the center channel image move with him, but not farther out than the center speaker on that side.
