Yea, for 10 IG accounts one 4G/5G proxy is enough.
I would try without rotation first.
You could also track how often the IP changes on the proxy by itself (https://ipkit.io/)
i don’t think you should be using one proxy for all 10 account, especially these days but you can try that and see how it goes, i woud recommend 2 proxies but you test with 10 and see
since you have no issue you can keep the non rotation for now.
try to lower the number of accounts per proxy to half then start the IP auto-rotate option
make sure to lower the actions on those accounts as well and start very slow again and use few other tools and not just blocking followers that will look unnatural to IG which will keep giving you issues.