Atmos and DTS:X both work best with all monopole speakers, so if possible, yes, replace the front height QS8s with something monopole instead of quadpole.
DTS:X caters more towards being able to use front heights like that, Atmos wants them on/in the ceiling at particular angles from the listening position. There is overlap in positioning that falls within both the DTS:X and Atmos recommended angle ranges, but that range is on the ceiling only.
I have a photo somewhere of my trade up boxes all ready for shipping. Four QS8s and a VP150. In their boxes, it was quite the pile.
