Edwin, welcome. It's a little difficult to picture what is meant by the wall that would be near the left QS8. Apparently it isn't behind the QS8, which wouldn't be a problem, of course.
When there's going to be a rear speaker or speakers in back there's no need to have the side surrounds farther back than the listening position to provide some "back" effect, so the ideal position is straight to the side. So, option #1 would be generally preferred, if the sound wouldn't be actually obstructed, but would bounce off this wall toward the listening position.
