My room is just about exactly this dimension, and after a lot of playing around I have ended up on the short wall with the speakers pulled out about 3 feet from the back and side walls, and about 7 feet apart. I sit about 7 feet away, so basically near field listening. Slight toe-in. Imaging is great.
I do like the long wall idea but I agree with the poster above that the room would need to be bigger.
I do like the long wall idea but I agree with the poster above that the room would need to be bigger.