Due to the object based technology powering Dolby Atmos, it is impossible mastering the final mix. All elements are processed in the Dolby Atmos renderer/decoder and distributed to the right loudspeakers.
The advantage is the scalability of the loudspeaker system. Atmos will always be more accurate in positioning sounds rather than channel based technologies.
However, the major downside of course is the inability to master the final audio mix, resulting in a less impactful experience than channel based systems such as Auro3D.