I just got a quote from Wawnesa. Nationwide was cheaper by a few $100.
One thing to keep in mind is what your insurance company will pay if you wreck your car. Most insurance companies, not all, will only pay standard shop rates around $50 an hour. Tesla certified shops normally charge around $125.
I made sure to talk to my local Tesla repair shop to find which company pays without a battle. Geico and Nationwide do.....Farmers, Allstate, State Farm and Esurance do not.....you have to pay the difference.