Took their bait of "Free Cancellation" and made a reservation then found that the coverage they were including for Iceland was bare bones. Found that for the same cost other rental car companies in Iceland include CDW so cancelled my reservation to get an email back that my deposit had been 'forfeited'. So beware "Free cancellation" is a bait and forfeiture will be the switch if you cancel.
If you don't cancel your cost for CDW could double your cost. Then you can also imagine the CDW that a sneaky and scammy outfit would provide you. To carry your own CDW for any car rental I recommend the coverage provided by Allianz. I found them under my AAA membership. Go to aaa.com
then look under Travel > Travel & Trip Insurance. Currently the per day cost for 40K USD covergae is $9.