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What type of overload protect should be used when a Variable Speed Drive has multiple motors connected in parallel

Often a VSD will have two or more motors connected in parallel on its output as long as the total Full Load Current of all the motors added together is not greater than the drives Maximum Continuous Current there should be no problems.

Another point to take into consideration is the dv / dt that is generated by the capacitance of the cable so it is advisable to fit a motor choke in the drives output.
The over load protection should be provided for each motor by an LRD** type and the control wire as to stop the drive if a motor is overloaded.

 It is recommended to disconnect a motor from the VSD while under load as this can regenerate voltages back into the drive damaging the
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