I feel your pain man. The solution I came up with for surge protection is to use a whole house surge protector. There are different models depending on if you are using 3 phase or single phase. Here is an example:

https://www.homedepot.com/b/Electrical-Power-Distribution-Whole-House-Surge-Protectors/N-5yc1vZbm05

Another option is to use tripplite Euro-50. It works with 50 and 60 Hz, but it only works for like 10 amps or something so you can probably get away with 2 miners for each unit:

https://www.tripplite.com/isobar-4-outlet-200-240v-surge-protector-2m-cord-680-joules~EURO4

As for amps, just use a clamp ammeter on the line. It is pretty consistent if you can keep your temps regulated and your miners clean.

https://www.kleintools.com/catalog/clamp-meters/digital-clamp-meter-acdc-auto-ranging