A:Answer Hello and thank you for your question. Yes the AVR-S750H does decode Dolby Atmos.
Set up a 5.2.2 Dolby Atmos speaker configuration.
-Denon AVR-S750H 7.2 channel full 4K Ultra HD AV receiver with 75W per channel (6 ohms, 1 kHz, THD 10%, 1ch driven), Dolby Atmos®, Dolby Atmos Height Virtualization Technology, DTS:X™, DTS Virtual:X®, new eARC support, HDMI (6 inputs/ 1 output), Wi-Fi, Bluetooth and HEOS Built-in wireless multi-room music streaming and voice control compatibility