I showed this to my son who’s a pro installer and he indicated that Russound can’t do what you’re wanting.
That said I have to wonder, if three companies told you they could do it with Russound – is there some reason that you distrust them? If Russound is the only brand they deal in then sure, I can see the concern. But if they deal in several brands, I would expect that they should know which one has the products capable of achieving your goals (unless perhaps they’re being hamstringed by the budget).
BTW, my son thinks it’s better for the 5.1 systems to be local (independent). I mean, do you really want to trek across to the other side of the house, or down to some basement, just to load up the DVD you want to watch? What a hassle.
Wayne A. Pflughaupt