1
You absolutely must call the cc company to ascertain the coverage on the card you intend to use; then use that card for all transactions connected with the rental. Both Cap1 and Chase offer so many different cards, it would be foolish to try to figure that one out by yourself or to take advice from amateurs here. Also, cc companies change their specifications. You need current information.
2
I don’t believe France has the mandatory liability insurance that Italy does, so you are free to decline insurance offered by the rental company. Some posters here will say taking the insurance gives them peace of mind. Any time I have checked the cost, I have found it to be very expensive sometimes doubling the cost of the rental. Additionally, you must read the fine print carefully. One time when I checked I discovered that the so-called no deductible excluded windows and tires.
3
A number of posters will tell you that there is a lot of red tape or hassle involved with making claims using your cc insurance. I can only offer my experience. Once, I made a claim on my Chase card. If I remember correctly, I paid the charge the rental company put on my cc. After I completed the paper work, I was reimbursed in about 6 weeks. Another time, I made a claim on my Amex card. They put the charge on hold, and removed it after paper work processing.
If you have an Amex card, the best deal going is to sign up for their Premium Rental Car Insurance. There is no charge to do so. Any time you rent a car using the Amex card, the insurance kicks in for a charge of approximately $25 for the entire rental period, up to 40 days. I have also needed to make a claim on this insurance, and it was totally hassle free. Tires and glass are not excluded.
Lest anyone think I am very accident prone, I would state that these occurrences happened over a 35 year period of driving in Europe, and were minor; a small dent, a broken side mirror, and a broken wind shield. However, since two of them involved glass, I’m particularly careful about the glass exclusion issue. Perhaps I am maligning car rental companies, but I believe that any loophole, such as a deductible or exclusion, is an invitation to them to drain your purse.