If you think that errors (GPS jamps and others) are caused by interference from the engines, then this article will be useful for you. Most of the anti-jamming is already implemented on PCB 1.3, but the capacitors, which are installed directly in the motors, you must solder yourself.
I do not use any additional protection against interference, except for twisting the power wires. In the statistics for 5-6 hours of continuous operation of the rover, I have't any errors.