This or a similar company:. https://www.lifestorage.com/storage-units/vehicle-storage/

Offers in unit or within grounds storage of vehicle. Yards are locked and gated. Monitored and insured.

You can either ask if they have additional vehicle storage insurance or ask your own car insurance company to change your policy to a Storage only policy (meaning no driving/mileage, only otherwise insuring it for damages/loss. It's usually pretty inexpensive compared to a total loss.