Yeah, I've spent a lot of time trying to find the best way to find Atmos tracks on Tidal and there isn't one. Searching in the Lucid is difficult, and CarPlay actually is even harder, so the best way to do it is in the desktop app or on your phone, and what Tidal does is they do have Atmos genres but I don't think about Music as "genre", so as a result you'll miss tons of great stuff if you're only looking at Tidal's 80's Atmos playlist for example. To make matters worse, the tracks are not named consistently, some times it will just say Devo Whip It Atmos Mix, sometimes it will say Prince When Doves Cry (Atmos Mix), sometimes it will just say Atmos, there's just way too much inconsistency. There should be a way to just add "Atmos" to the search term and it should immediately come up as the first choice, but it doesn't. What's also stupid is Tidal actually has plenty of great custom playlists... but only on the phone app. They don't show up at all in CarPlay, you only get "My Mix 1-6", and the only one that shows up in the Lucid version of the app is "My Daily Discovery", you don't get the other playlists aside from My Mix 1-6, and those Tidal playlists aside from My Mix are actually pretty smarty curated and worth listening. And then what's extra frustrating is that while in the Lucid you can get Tidal to play you new music via My Daily Discover, well too bad if you like any of the songs because it won't let you add anything to a playlist or even click "like"! Meanwhile CarPlay does allow you to like the track which then adds it to your saved tracks... but doesn't give you the Daily Discovery playlist to find new music from. It's just a stupid dumb aggravating mess of chaos and inconsistency.
AppleMusic is no better, but the one upside is it allows you to add things to playlists if you like them, which is nice, but it doesn't do Atmos via CarPlay, and also to my ear I've played back identical tracks in Apple Lossless and Tidal Hi Fi Plus formats and Tidal absolutely sounds better in the car, and neither of them sound as good as original files on USB drive. I think the Tidal superior audio quality as compared to Apple Lossless via CarPlay though is that there's something about the Lucid algorithm with Tidal that uses the car's DSP and speakers better, like the bass just sounds fuller and there's more depth of field in Tidal than AppleMusic. And Spotify is the worst in terms of audio quality, but also unfortunately is the best in terms of usability, customizability and music selection and algorithms.
So the TL;DR version is streaming services in the car, and in general in any car, are a total confusing to use half-assed mess where if you want the best features you're stuck with the worst quality.