I'm in a musical rut for sure, Tidal is the obvious solution because it integrates with Plex. What plan do you use (if you do)? I use PlexAmp all the time, have a lifetime pro subscription for plex. I prefer high quality but not sure about that $19/month pricetag...
I know this was from months ago, but I find it worth it and the integration is pretty solid. Keep in mind that even the $10 per month tier gives you access to FLAC at 16bit 44.1kHz - the more expensive tier takes you to 24bit 192kHz.