It's hard to really appreciate Dolby Atmos if you don't use the proper speaker setup. The whole idea is to envelope the room with omni-directional sound & that heavily relies on the speaker placement. It's not suited for headphone use & you won't be able to appreciate it using that tiny speaker on the S8. On the other hand, the speaker placement on the A7 was designed to support Dolby Atmos. If you really want a proper Dolby Experience, AMC now offers a Dolby Theater for select showings with Dolby Vision & Atmos.
If you're using headphones Dolby Digital Plus is the way to go. You can install the codec on Google Music for the V30. See the link below: (It's really Dolby Digital Plus not Atmos)
https://techonation.com/install-dolby-atmos-on-android-without-root/