@enoch85 Yes collabora works with some pain even with the scripts, I have it working but receive some errors from time to time. We love it but always crossing fingers while using it. Also an important note that sometimes collabora changes the format of the excel sheet and here it is a real pain.
We are trying Onlyoffice, very easy to implement (no need for second domain and no need for ssl)
Install option 1:
http://helpcenter.onlyoffice.com/server/docker/oneclickinstall/index.aspx (never worked for me)
Option 2 :
https://github.com/ONLYOFFICE/Docker-CommunityServer/issues/22 (this will run the community server with the document server and email (client only not server).
Finally
Nextcloud implementation: https://api.onlyoffice.com/editors/owncloud