So, I now have a Bluesound Node 2 (original, not the "i" as I use a wired connection and digital interconnect so no reason to upgrade) and Apple TV 4K. Between the two, with the exception of Atmos on YouTube or Amazon Music, I now have Amazon UHD capability for music and 4K/Atmos via Amazon Prime video, Netflix, iTunes, etc. Works well although the user interface between Amazon Music and BluOS isn't great. I assume it'll improve as Amazon gets their s&*t together.