I have a Samsung NU6900 4k TV (2018), and an Apple TV 4k.  I watch everything through the Apple TV (Apple TV+, Netflix, and Hulu) and I only use the Apple TV remote.  Utilizing a Beam I just bought and a pair of rear symfonisk speakers.

The only way to get Dolby 5.1 from the Apple TV 4k seems to be changing the audio out from Auto to Dolby 5.1

At this point my TV recognizes the Dolby Signal and passes it through the HDMI Arc  port to the Beam.  I then get an uncorrectable lip sync issue.  If I leave my Apple TV sound on AUTO, then I only get a 2.0 PCM stream to the beam.  I check this via the TV and the About section in the app.  I have tried every setting and the lip sync correction in the sonos app and my TV (which only goes one way).  I have also updated my TV firmware to be safe.  Its a budget 4k TV, so my guess it just can not compute fast enough.

Since I am only using the Apply TV 4k (in full 4k) for viewing, I want to get a splitter or extractor.  A splitter to split the HDMI to go to the TV and then the other HDMI to Beam or an extractor to go Apple TV and HDMI to TV and then TOS Link → Sonos Adapter → HDMI to the Beam.

I need the unit to also use CEC pass through, so my Apple TV can turn my TV on and off, I have no interest in adding another option to the mix.

Anyone using a unit that they can recommend that will work?  I am also not interested in spending 200$ the the HD Furry, looking for something cost effective.