I appreciate the replies!
The image below will drive a better understanding vs. the diagram...
The area to the direct left of the couch is the walking path, thus, any speaker mounted to the wall there or hanging from the ceiling will be in the way. FWIW the area to the left of the half wall is a bar area. There is really no room for any speakers to the left/right of the listening area and the walls against the basement wall were trimmed with ripped 2x4's so there is really no depth on the right side to mount in-wall speakers (done that way before I owned the house). Stairs are to my left, and behind me is another open room, thus, no rear wall to the listening area. The left side surround (not shown) mounts on the wall before the door and is angled to the center listening position. It's appx 3' back from the back of the couch.
The right side has a kickout and the old rear surround used to mount on the wall near the corner at an angle pointing to the center seated position. It's appx 2' from the back of the couch.
Far from optimal for rear surround and why I'm trying to figure out how to use the 502's and not have to deal with replacing them with 600m's and going back to the same configuration I had before...I'm trying to avoid hanging things from the ceiling.