I was thinking of placing the one above the other powered seperately.
In theory if the lowest speaker was a foot or so below ear height and the second a foot or so above the results would be more natural envelopment.
I don't own any QS8's yet so I'm expecting some negativity.
Still thinking of ordering 2 pairs and running my surrounds in this manner. If it doesn't work I'll swap the QS4's to the back and throw the 2nd set up front as presence.