As far as I know, a Plex Data Folder is a Plex Data Folder.
The only difference I’m aware of is the “additional settings” that is stored in Windows registry vs preferences.xml on Linux vs a .plist on a Mac.
Regarding Plex Data Folder ownership & permissions, take a look at the Linux Tip: Migration from another OS to Linux.
Adjust as needed for running on a Terramaster (if Plex runs under a different username and for the different data folder location).
To set ownership:
# chown -R plex:plex "/var/lib/plexmediaserver"
To set permissions:
# find /var/lib/plexmediaserver -type d -exec chmod 755 {} \;
# find /var/lib/plexmediaserver -type f -exec chmod 644 {} \;