Chad, have you raised your question with Brian at VMPS? He should know better than anyone what both the minimal and optimal room dimensions would be for your speakers.
Of course there is the danger that you may not keep the FF3SREs the rest of your life (or at least as long as you remain in your future home) but I would guess it is not likely you would replace them with something radically different that could not be adapted to the same room.
Of course there is the danger that you may not keep the FF3SREs the rest of your life (or at least as long as you remain in your future home) but I would guess it is not likely you would replace them with something radically different that could not be adapted to the same room.