How to Insure Car Rental?

Hello and a happy new year. Since I run a car repair shop on my side, I think about offering my leased company cars to the customers if they need a rental car. I have read that these vehicles must be insured as self-rental vehicles, there is also an entry in the vehicle papers. This will certainly not be approved by the LG and would not be wanted by me, then the customers themselves have to provide for mobility. As I said, I will spend most of my time with d the vehicle and the award ceremony will certainly be manageable.