I would like to see Roon have a native app for apple tv 4k that would support hi-res and ATMOS Playback.
I used the Tidal app and searched on Dolby Atmos. There is not a lot of content, but what there is sounds very good.
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Apple TV 4K only does 16/44.1 I believe.
Ya interesting that Apple doesn’t specifically say in the specs.
This is what is supported on thier website… HE-AAC (V1), AAC (up to 320 Kbps), protected AAC (from iTunes Store), MP3 (up to 320 Kbps), MP3 VBR, Apple Lossless, FLAC, AIFF, and WAV; AC-3 (Dolby Digital 5.1), E-AC-3 (Dolby Digital Plus 7.1 surround sound), and Dolby Atmos
I have an Apple TV 4k with a free Apple Music account provided by Verizon Wireless. I rarely use it.
I use mine all the time for video and it works great for ATMOS with streaming video services. I would use it for audio with Roon if it can/could handle high res audio. Thing with ATMOS is it can be wrapped in a dolby digital plus stream or True HD stream…
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Hello Everyone,
Dolby Atmos content is only available to Tidal users running the Android Application. We have nothing to add or comment regarding Dolby Atmos support with Tidal at this time.
-John
Off topic but this is the problem with ATMOS on music services as of now. Amazon only streams ATMOS to a smart speaker and Tidal to the android phones. I want to listen to ATMOS on my home setup.
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This whole Atmos streaming thing is a joke really… Just another format set up to fail
Usually Roon is better at communicating than this 
Roon support for Atmos was brought up and discussed here: Roon support for Atmos? Automatic For The People in Atmos!
The prevailing wisdom was that because RAAT only supports 7.1 PCM channels, the Atmos channels, which are encoded as meta-data, would have to be extracted from the meta-data and transported over RATT to the endpoint. RAAT would have to be redesigned to support either bitstream encoded data or additional channels.
It would be nice to know if this is in-fact the case. In either case a big change for a niche application at this point. I just hate being in that niche. 
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Perhaps, but if you like REM: Automatic for the People, you should give the Atmos version a listen. It really is a very nice addition to an awesome album (IMHO)
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Can you explain how you got it to play on your dell XPS laptop?
I mean the streaming side of Atmos, the information put out about how to use it is minimal and Google want you to stream it to a single speaker (the Echo Dot ??) ! Stupid…
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Using the Microsoft Dolby Atmos app.
and you did stream it from Tidal? Would like to listen to some Atmos albums, but in my understanding it is only available on android.
I streamed Dolby Atmos Albums directly from Tidal. It sounded great, but I cannot guarantee I was hearing the actual Atmos mix, but I’m 99 percent certain I was.
Also give the 30th anniversary of INXS Kick a listen. Decent atmos mix. Nothing earth shattering like a well mixed Atmos movie but interesting nonetheless.
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Thanks for the tip 
Please do not present subjective opinion as fact. It’s not.
Atmos is different, not better and there is no other valid argument here. You may have a preference, a belief and an opinion regarding one system over the other, but you cannot present this as fact.
I think Porsche make the best drivers cars in the world, but that’s my opinion. I don’t go into motorcycle forums, tell them two wheels are stupid and that they should go try driving a Porsche instead.
It’s frankly rude, as is much of your choice of language.
Consider your tone when presenting “opinion” in the future.
It is not my opinion, it is a fact.
The 2 channel reproduction is inaccurate and problematic per se.
More reading is needed.
Try Dr Floyd Toole’s 3rd edition.
Minimum suggested setup is 5.1 and the “.1” needs to be at lest 2 subs, with 4 subs having superior response.
Again, these are not my opinion. 