Hi,
I will be going and renting a car with Avis in Serbia for a duration of about 2 weeks. The cars in Europe come with CDW which covers me with me being deductable 10% of the damages or up to 700 euros. I know my United Visa covers me the full amount with no deductable. Because Serbia is an odd country I would like to keep the regular CDW but have some additional insurance - however the SCDW through Avis is about 11 euro extra a day which is not worth it (reduces the liability from 700 to 200 euros when I am at fault).

Does Amex or any other credit card program offer additional coverage on top of the rental company's CDW?

Thanks!