Hi

The short answer is ‘Yes’, ARC is fine.

Please look at the excellent article from @AjTrek1 which compares the functionality of different Sonos Devices: Sonos Speakers: Product Comparison Chart | Sonos Community

Also, if you look at the FAQ section at the bottom of this page, it explains the differences between eARC and ARC: Sonos Beam: The Smart TV Soundbar with HDMI Input

Yes the TV’s HDMI ARC port is fine, as I use a similar setup. The only thing to be aware of is the TV sound output will likely not support Atmos compressed (DD+) and certainly will not support Dolby TrueHD but you should get DD 5.1 surround sound. You can of course get around the limitations of the TV by using an audio extractor. See links below for further reading…

HDFury Arcana

https://www.hdfury.uk/product/hdfury-arcana/

Feintech VAX04101

https://feintech.eu/en/collections/hdmi-topseller/products/feintech-vax04101-hdmi-earc-pass-switch-4x1-for-soundbar

OREI HDA-931 or OREI HDA-935

https://www.orei.com/products/dual-hdmi-earc-audio-extractor-converter-4k-60hz-18g-hdmi-2-0-arc-support-hda-931

https://www.orei.com/products/dual-hdmi-earc-audio-extractor-4k-60hz-with-optical-port-3-5mm-jack-18gbps-bandwidth-hda-935

Ezcoo

https://www.amazon.co.uk/Splitter-Soundbar-Bi-direction-Breakout-HDCP2-2/dp/B0BBZGPT6F