Organiser for playing uncompressed music from NAS to Kef LS50 wireless 2

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Here is a video on how to link a NAS to SONOS https://www.youtube.com/watch?v=bppg9K28sPg
You can go as simple as DS218play or something more future proof like ds220+.
Or Qnap 51D/ 53b/ 64 series
Here is how to enable SMB https://nascompares.com/answer/smb-v1-co...for-sonos/

Enabling DLNA will broadcast available media libraries to local network devices including TVs.

I hope this helps.