The on walls as high as they can go would be effective. I'm using my M22 As on wall height, The sound stage is massive. Not sure how they would correlate to the LFRs. already huge stage.

If you do ATMOS in there you probably want to make it more of a theater room. Or swap the table for couches at least for watching night.
Another thing you might want for ATMOS is a heavy duty curtain to block those windows reflections.