Beware if you rent Enterprise in Europe. You need to book on US site, but the rental agreement you will get in a European country has different charges that you are quoted on the US site.
One time charges are changed to daily charges. When you pick up the car, you will get a contact not in English.
They will not provide a translation from German, and it is a 'take the car or the guy behind you will' situation. The contract they emailed to me could not be read by Google Translate, in an unreadable format.
Expect charges 30% higher than your confirmation when booked on the US site. They refuse to discuss, Amex is dealing with it for me.
I believe this is fraudulent business practices.