Max R720xd on a circuit

Hello,

I have a cabinet with four 20A 220V circuits....can someone let me  how many R720xd's (two supplies) we can fit in this cabinet.

I've assumed 325W per system, and max power is 32A (assuming all load is carried by just two circuits)

32A*220V = ~7kVA/ 325 ~ 20 systems total???

Thanks