Gathered all music/Audiobook Files on my Synology NAS, organized in folders. Beside, there is still a Lyrion Music Server (LMS) running on the NAS in a docker. Put the Squeezer Play Client on every possible device (Windows, Linux PC, Android, Tigerbox, Pi zeros) and streaming works well for me at Home.

Access either via Web or App on Android/iOS. I have enabled navigating in LMS via folders because ID3 Tags are poorly maintained in my files. :/