Yes this is my solution until now. But not the best way 
Modern MacOS versions have a lot of things on it i dont need and what makes the system instable. Notifications, icloud sharing and so on. And i dont get the file sharing service activated to copy files from an other mac to the plex server drives.
I would like to use my Intel NUC8 as plex server but im a little bit cunfused that there is no easy way to do this until now. I tried it with an ubuntu system and with openmediavault but that was not a solution.
In my mind it should be easy to create a „PlexOS“ image with an simple linux core with plex server app integrated that should make it easy to run a plex server on any computer 
