I had a corner layout like you and ran a 6.1 system I had one QS8 above and to the side of the 3 seat couch but mounted to the wall behind it, the back center more or less above and behind the chair and the Left surround mounted to the far wall behind and above the loveseat. This layout worked great.
Your speaker positioning will work even better than mine did as the Right surround is farther off to the side. I would still move that Left surround to the wall beside the love seat and add a rear center channel behind the chair.
