Looks like that EM330 grid meter will do up to 480V L-L and 277 L-N nominal 3-phase, so that is good.
It has a max overload voltage of 1.2Un, which would be 576V, so no problem there either.
Is this configuration using three of those new Victron 277V inverters in 3-phase?
I have not done what you are asking for, but if I were to do it:
I would go to Settings, Set Alarm Rules >, Add New Alarm Rule button. The 60 second delay in notification might be a dealbreaker for your customer.
Note that you will need voltage rules for each phase independently.
And frequency checks as well.
I’ll try it for 120V and see what happens.
