Hari, the most commonly suggested location for the surrounds is about 6' up on the side walls and maybe 2' behind your seating position. In your rather small room I assume that the couch will be close to the wall behind it. In that case mounting QS4s on the back wall about 6' up and spread widely(about 1' from the side wall, or where a side wall would be)should be very good and give you much the same effect as a side wall mounting behind the seating position.

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Enjoy the music, not the equipment.