If the couch is right up against the wall you might be correct, as there would not be much room behind you to place speakers. The two speakers on the side wall, if you get Qs8's, would direct sound off the back wall.

Can you move the back seating forward a bit, or if you have a little space, you might be able to place one (6.1) or two (7.1) speakers along the back wall, and move the side surround forward a bit more.

Do you have a picture or drawing of the room?

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