The Q series speakers are a quadpolar design which gives you 4 drivers all in phase. This is different than direct radiating or bi/di pole design speakers. Yes, for the most part you want to consider Dolby recommendations as Alan does here
http://www.axiomaudio.com/home_theater_layout.html , however, even Alan and others will tell you the Q's are more forgiving/enveloping than other designs. This is done to simulate what you see in theaters, when direct radiating speakers are lined along the back/side walls.
You want them to be at least 2ft and higher, above your ears. Many of us have them 5-6ft and higher using DIY mounts or omnimounts. Also, per Dolby, with such a design, you can goe 15degrees in front or behind a horizontal line from your ears.
A qoute from Alan "The QS4s or QS8s are extremely accommodating to eccentric or asymmetrical placement. Even Dolby Labs says a range of 15 degrees forward of or to the rear of a horizontal line drawn across your listening area is quite acceptable. Nor do they need to be at identical heights or distances from the listeners."
