Basically unless you have a model with permanent installed battery - there is no need for Rx switch.
If you did install a Rx switch - then a normal RC Rx switch is more than enough as its only cutting the 5 - 6V low power Rx supply and has nothing to do with the high power motor supply. But I suggest its not a good idea to have power to ESC / motor and Rx cut out ...
Better idea is to use the Throttle Cut switch on your Tx.