7.2.4 setup advice

Hey guys need some advice on this setup.
My room size is 20x20x10 ft
My setup will include
Pair of rtia9
Csia6
4 svs elevation speakers for atmos
dual hts 12 subwoofers
About the surrounds I am confused which one to buy ( rtia7,rtia5,rtia3 or fxia6)
And I will power my fronts from an external amplifier the rest will be powered by yamaha rx-A3080

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