I'm thinking of putting acoustic panels at my first reflection points, but am worried they might negatively affect surround QS8's since they rely on reflection. Should I still bother?

Also, if I have a second row of seats which is elevated then won't I have a second reflection point (don't know if that is the right term)? Should I add a second set of panels for the second row or just treat the front row? If I add a panel for the second reflection point wouldn't I have to have it elevated (in relation to the panel for the first reflection point) as well?