Federated self hosting

https://lemmy.cafe/post/30860

Federated self hosting - Lemmy Cafe

Is there a good way to self host a federated service at home without port forwarding? Is it possible to use cloudflare tunnels or tailscale funnel and still connect to the federation?

Slightly unrelated: is having your own instance and then federarating, just like people do with Mastodon, also equally valuable with Lemmy?
It's certainly easier on storage. Doesn't Mastodon cache like, every image to your instance?