You talk about MOVs so I assume you are talking about protection for the load circuit.
Your motors will probably work justfine with no surpression devices for the load circuit. However, there may be switching transenents that have an effect on other electronic devices in the shop or house/building. You may have to add some devices to prevent this. But you can install it and see what happens first. Then add whatever is needed.
However, it is also common to use protection devices in the control or coil circuits of relays. You said you are using "electronic control" and most commecial "electronic" control circuits will have diodes or some other form of protection built into the coil circuit. This is necessary to protect the electronic devices (ICs or transistors) from damage from the back EMF (Voltage) when the relay is turned off and to keep spikes out of the power and ground circuits of the controller. These spikes can cause all manner of problems in logic circuits because they can look just like logic pulses to the ICs. If you are designing your own control circuit, I would strongly recommend that you take this into account. A DC control circuit usually uses reversed biased diodes across the relay coils. I am not as familiar with AC controls and am not sure what would be best.
Make it fit.
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