Hi ajb,
Congrats on your progress with your wife and the QS4s. You can get them or QS8s with tan grilles, if that makes any difference.
John is correct: experiment with temporary positioning to see how they sound. If you want to adhere to the Dolby Labs specs, the surrounds should go to the sides of the listening area, above the level of seated listener's ears, up to 20 degrees forward or to the rear of an imaginary line drawn across the listening area. There's lots of flexibility with the QS surrounds. They are not usually "fussy" in terms of placement the way direct-radiating surrounds can be.
Regards,
