^ sir, am I correct to assume you will use the TV's USB movie function or Netflix?
TV's even when they said Atmos-capable only means that they can "read" Atmos encoded materials but will only send upto 5.1 (6ch) audio bed to your AVR. no audio heights information -- even if you use a cable HDMI v2,0a or v2.0b thru HDMI ARC ports. with your AVR, it will say only Dolby Digital 5.1
difference when TV "does not read" Atmos encoded materials, there will be a notification something like: "Audio not supported..." and there will be no sound from the TV speakers, only video. if connected to your AVR via HDMI ARC, it will say UNKNOWN audio
if you have ATMOS capable AVR and have many ATMOS materials or watch NETFLIX Atmos, then buy a separate ATMOS-capable media player
this will be your required HDMI connections:
media player --> HDMI 2.0 --> AVR HDMI OUT --> HDMI 2.0 --> TV's HDMI IN