I might be wrong. But I think the reason they created Atlas was to give Stripe access to non supported countries. They will do all the work with incorporation, opening bank account, etc. And you will operate your business from the US bank account. After your business has a credit history you can even have credit cards.
You will probably need an accountant in Brazil to see how you declare your business entity in the US and also an accountant in the US to declare you US taxes.
You will probably need an accountant in Brazil to see how you declare your business entity in the US and also an accountant in the US to declare you US taxes.