It's very frustrating as there is still no one box solution. Shield won't do ATMOS on Netflix not sure about prime. ATV supports the most streaming services with ATMOS. I have FireTV,s and that supports ATMOS on Prime but not Netflix. HTPC with windows 10 supports ATMOS on Netflix but no other streaming services. HTPC with MadVR is by far the best for playing rips with 4K/HDR/ATMOS.
"Smart enough to know better, to old to care" ------ Dedicated Bat Cave Home Theater, JVC RS49U/Mitsubishi HC7900DW Projector, 110" 16:9 Jamestown screen with variable power masking for CIW 2.50:1 to 16:9, Marantz 7009 with 7.1.4 Atmos with Ohm mains,3 DIY Subs (2 15" (1 ported, 1 sealed and a 12" 4th order bandpass), 1 DIY butt kicker, Custom Built HTPC, 18TB DroboFS NAS