Profiles/Books

Hello,

We are doing a global implementation in Latin America and I wanted to see if this set up makes sense...

So each country will have a unique Business Units with specific local books/tax books to accomodate local requirements. When setting up the Profiles -- if each book has a different useful life/depreciation convention, would it be best practice to create different setIDs? Or would we set up the profile with one setID, but add multiple books from multiple countries? Also, is there a maximum number of books that can be added for a profile?