

GoToSocial is just another Fediverse software that works with multiple users like any other. The difference is really only that it is tuned more towards smaller instances and as a result is easier to set up and maintain. It also assumes most people will be using a mobile app with it anyways and thus the built in webclient is very bare bones. It does work fine with external webclients like Phanpy though.
What you need to be aware off is that the LibreOffice based options run a full headless LibreOffice client on the server for each connecting user and stream the view as tiles to the webclients. If you mostly use low power devices to access your office files remotely this can be great as it offloads the processing to the server. But I think in most home server or VPS settings the server speed is the more limiting factor.
OnlyOffice on the other hand runs entirely in your browser and thus puts little extra strain on the server.