I have been using them for over a year. THey have the same flow as Cloudflare, point domain to thier CDN, set CDN Pull Zone to target your server. I havent had to do anything.
They even support websockets.
Why they cant do is the TUnnel stuff, or at least fake it. I have ipv6 servers, and I can't have the IPv4 Bunny traffic go to the ipv6 only sources.