I do not understand the limits for your Data Studio product. I see there is a 20 account per connector limit, but I can't tell if that means each query to a system like SEMrush counts as a unique account, or if using the same account am I instead looking at the query limit per day?
If so, what is the query limit per day for my $99/month account for systems like SEMrush?
Please see this article that describes how the Ad Accounts per Ad Network restriction works:
Using your example - SEMRush is not an Ad Account, so it does not need to follow this limit.
If further clarification is needed after checking that, please let me know.