I just set this up yesterday. I was already hosting DNS for my domain with them (free). I setup a cloudflared
container on my unraid to point to my traefik reverse proxy. This video was a great step by step to do this. (also free)
Then I took it a step further, and setup cloudflare access with a Google as the authenticator, so all my apps are secured by my google account. (this too is free!) I didn’t follow a guide, but it’s pretty intuitive and cloudflare itself walks you through all the steps to setup the authenticator.