Collabora and Nextcloud
I run Collabora in a container on my Nextcloud instance. It works fine for my needs (spreadsheets mainly).
In a worst-case scenario, if the containers fall over I can rysnc the actual .ods over and edit it locally. It's haven't needed to, but it works OK.
There was some faff in its configuration initially, but if LibreOffice can simplify the installation and integration, they'll be on to a winner.