I am looking to buy a Sonos Arc for my large great room. It’s 18.4’ x 19’ with the open dining room behind (11’ x 19’) and open kitchen to right side (29.4’ x 18’). All together the space is very large but the couch is in the great room space. 

I plan to have rear Origin Acoustics (D81) in ceiling for rear surround. I also plan to buy the Sonos subwoofer. 

Thoughts on this setup?