Certainly not overkill. Can it ever be overkill? Looks like the main seat for the HT is about 15-16' away I would even suggest a M80 center if the screen is going to be high enough otherwise dual M2s or dual VP150s on e above and below the screen to really anchor that center channel home.

Looks like it is going to be a wonderful place to enjoy some R&R.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70