Great job! 1 account per proxy is the safest way to run things.
For PV, it doesn't really matter from which country the numbers are. As long you can get the code and use it to verify your account, you're golden. Just make sure the numbers you use are not 'tagged' by IG in any way.
There are a lot of providers at BHW. You can try smspva or textnow.com. I, myself, am selling sim cards from the Philippines used for IG verification.