@Lisa_Crato, to answer your questions:
- a subnet limit of 2 per country means that in each subnets only 2 node machines can be located in the same country.
- a node provider can have no more than 42 node machines, whether across all subnets.
SEV/SNP is additional security functionality on the AMD processors that is used by the IC network. So for a brief explanation AMD SEV Virtual Machine Support. Hence the hardware requirement for AMD processors on the Gen2 node machines.
Hope this answers your questions.