Configuration Owner Tax Options for E B Tax

Dear All

I need some information / Help on "Regime Determination Set" under setup "Configuration Owner Tax Options"

Here is background.

At present we are on R12.2.7 version. This instance is upgraded from 11.5.10 in year 2019.

I am setting up a New ledger / New Tax regime for France entity.

Have question around it. While setting up "Configuration Owner Tax Options" should I select "STCC" or "Determine Applicable Regimes" against "Determine Applicable Regimes"?

The further requirement is we need to have two taxes on AP Side. It means in AP Invoice we need to attach say 5% and 9% tax rates. To achieve this i believe i need to setup Tax Rules since "Tax Groups" is not standard feature of R12.