I am regularly asked questions similar to this by new business owners or business owners expanding to a new venture. Insurance has many niches that exist in the commercial insurance space, this is one of them. A couple of places to start;
1. If you already have a broker who handles commercial insurance this would be your first conversation.

2. Even if you have that, a second opinion is a good place to start. Do a quick search in an area in a different part of your state. Try and find a similar operation. Call and introduce yourself and see who they use. Since you are not competition they are likeley to gladly make a referral.

3.Typically associations have a ready made policy just for you. Give this a shot; https://www.acraorg.com/

4. if leasing from a larger operation, I bet they have someone ready and willing to speak with you as well.

Best of luck. Happy to chat further.