The Aerius speakers are a pain to place. Even moving them a half inch can change the soundstage/sound. I agree that in general, 3-4 feet from walls is a good start. These speakers also have a narrow sweet-spot. It is important to keep the listening position constant during set-up. It's a lot of work, but you'll know when you get it right: the speakers will sound great! Good luck!!!
I believe 4 to 5 feet from the back wall is best and around 7 feet apart. Mild toe-in - shine a flash-light on them from your listening position and the reflection should be about a quarter to a third of the way across the panel.
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