Yep, what OilPan said about the MOVs, from each 120V line to CHASSIS.
I go by the very shortes tlead length, breaker or disconnect output direct to box metal - clean off the paint.
If you use GFCI breakers, the MOVs may draw 1 mA, so GFCI is more sensitive as already has a 1 mA GFCI current draw.
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