Here are a couple more using the method of placing the subwoofer on the center seat and moving the mic.
Mic sitting behind my equipment rack (blue) in the back center of the room and the mic sitting on the floor of the front center of the room (purple).
behind equipment rack and bellow screen.jpg
Mic sitting on the right wall after adjustments (green) and mic sitting between the right tower and center channel (black).
right wall front and between right and center.jpg