As others have said, Reebok isn't an insurance company and they sponsor the CrossFit games and makes CrossFit's officially licensed apparel.
You might have a better response in the "Running a Facility" section.
But if you're opening a box, I'd go with RRG. It's insurance that was specifically designed for CF. I shopped around and the rates were similar and I didn't have to do anything special if I wanted to do park workouts, etc.