The async files are worth there investment cost... and are specifically made for your speaker layout.Well, sounds like using the analog outs is the way to go then. I probably need some adapter cables to connect to their setup.
From Club-Realiser "For a Dolby Atmos 5.1.2 or 5.1.4 or 7.1.2 or 7.1.4 room: room26"
The files are .mp4 and can played from the USB port of most Blu-ray players... But can also be played from laptops (VLC) with HDMI outputs.
I would 100% go async...