You have 2 voltage ratings to worry about:
Voltage required by motor to achieve design power and torque.
Voltage rating of controller - to make it capable of switching the power that goes to motor.
Too much voltage applied (over rating) applied to controller will usually/probably cause it to fail.
Slightly too high voltage applied to motor will cause overheating and overspeeding. The amount of overheat/overspeed is roughly proportional to the % of overvoltage.
It is best to have your parts all matched for voltage - IE 90v motor uses 90V P/S.
You can use a 80V P/S with 90v motor - speed/power will be reduced about 11% however.
Use of 100v P/S with 80v controller however may result in smoke emissions from controller.
For you motor, assuming the use of 4 axis at peak possible load, roughly a 90v power supply would give you 100% design speed potential from the motors. Current wise, figure 100% of 4 x 5.56 would give you a 100% duty cycle for current at "normal" useage.
For stall conditions, 4 x 38.93 x 60% should be your absolute "peak" current capability used with all 4 rotors locked (improbably) to look for from a P/S.
75V / 30 amp should work.