Adding a speed limiter

I wanted to know if using something like https://www.amazon.com/Motor-Speed-...electric+motor+pwm+hho&qid=1569691712&sr=8-13 with a switch to bypass would be feasible. And the best place to within the circuit to put it. Looking for street legal/off road toggle. Using 52v 30amp battery, a 48v 30amp contoller and a 1200w hub motor. Thanks in advance.