The two biggest insurers in the CrossFit world are RRG & Affiliate Guard.
When I shopped both for my renewal I choose to stay with RRG.
RRG was more expensive but better coverage.
Affiliate Guard was cheaper but the coverage wasn't as extensive.
If I was starting a new small gym today I would start with Affiliate Guard and switch to RRG in second or third year.
When I renewed last time I had a profitable gym with multiple trainers working for me. I was will to spend a little more to have the better coverage to protect myself and my business.