Below you will find links to the UPDATED best practice guides on 3D Immersive Audio and Dolby Atmos. These guides are up-to-date on the specifications and technicalities needed in studios no matter what the size. These guides also help with what speaker layout is needed, what DAWS to use and how to set them up, and what volume level to use for immersive music and audio creation.
I will add more to this list, when I am notified or updated with news and links to the guides.
DOLBY:
UNIVERSAL MUSIC GROUP:
https://contentguide.universalmusic.com/dolby-atmos-audio-best-practices/
FOCAL SPEAKERS: