Higher voltages are no problem as those mosfets are much easier to control.
I actually am driving 120V mosfets with 40V mosfets but vgs is higher that 3.3v and they just won't switch properly. (signal too weak) I have 3.3v output pwm/sine signals that must properly drive mosfets.
Frequency just like standard pwm 100khz-500Khz is fine.
I'd rather avoid avalanche situations because it is usually a death of mosfet)
For gate charge I guess it is similar to non rf mosfets and should be small