Hi Philippe,
The controllers should take care of the motor protection as they should constantly monitor the current draw and the temperature of the motor, and there is also a stall protection feature that will cut the power if the motor is stalled for longer than the programmed time period.
Each of the controllers also has its own fuse connected directly to the battery supply terminal to protect the battery/wiring against overcurrent in the unlikely event of an internal short circuit within the controller itself.
Just make sure that you have the Motor blockage protection enable and the Motor overtemperature protection enable both set to 1:Enable on both controllers.
You will also need to make sure that the Battery drawn current limit (A) on each controller is set to 50% of your battery's maximum rated current output (unless you are using separate batteries for each controller).
Alan
