Generally, you want your surrounds for 5.1 to be to the left/right sides of the listening area, not behind you. For 7.1, then yes, the rears are behind you, but the left/right are still to the sides.

If you have no options, I would at least spread the two Qs4's as far apart as possible, but don't get to close to the side walls as the tweeters are angled and this would affect the sound.

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