Does anyone have experience with fleet insurance for carsharing or rental cars?

A friend of mine has a car rental business, so I know it's a big issue, the main thing is that regular commercial insurance will NOT work, it's more expensive and harder to get. A friend got this https://www.ayroyal.com/commercial-auto-insurance-ny/ commercial auto insurance NY through A&Y Royal Insurance, he is happy with the terms, so I think you can check with them to find out what you are interested in