Hello There! I only tried with docker instances, but you will need some knowledge about networking if you plan to self host and open ports on your router. https://hub.docker.com/_/couchdb/
Unfortunately I don’t have experience with managed services to recommend. I also used it on a cheap VPS with the docker method with good results in the past. That would avoid all the self hosting complications.
This topic is something I would like to address in the future to make it easier to collaborate. Maybe another multiuser method that is not realtime but works with common sync apps like dropbox or even git. Any kind of feedback is welcome
Thanks!