Remembering that I no little yet It seems to me that MOVs only protect from high voltage spikes and unless the meter has some where to earth to then no matter what price the meter they become of little value (Connect Common First?). Mainly it seems that PTCs do the big job of breaking the circuit.
Oh yea I forgot ,all my kids have degrees and Doctorates and wealth including my Grand Daughter It,s only me that,s a mere engineer so I doubt they'll do anything dumb .