How To Manage Vat For Mv Marketplace?

Hey everyone, I am new to this so would really appreciate your help in tackling the VAT management which is way more complicated than I had given it credit for.

I am starting up a MV marketplace, initially in USA with the hope of soon expanding around the world. All the States and countries have different rules and it seems to be the responsibility of the marketplace to collect and distribute taxes. This is a daunting task with so many different rules and rates depending on states and countries and there doesn't seem to be much help or functionality for this with CS-Cart.

How do you manage it? Is there an add-on you can recommend or do you get a freelance tax adviser/ accountant to help etc? Would much appreciate some guidance.