No clue but you don’t need an HDMI video splitter, you’d need an HDMI eARC splitter.

Yes, you can connect two sound bars to one TV; but not Sonos. Sonos soundbars are designed as a singular connection via HDMI or Optical to one hardware source (TV).

Out of curiosity...what were you hoping to achieve?

Thanks for your reply. My wife didn’t want a single sound bar on the mantle.

So I was going to go with two bars one on either side that are on bookcases built in

That wouldn’t make much sense. A soundbar contains right, center and left channels, you want two devices with all those channels on either side of your TV? 

I’d think you’d be better off with a Sonos Amp, driving your own set of speakers. That way, you’d get your discrete right and left, with an interpolated center channel, and probably an approval from your spouse. 

If you use an AMP rather than a soundbar you can drive long skinny 3rd party speakers hung beside the TV. Note that this arrangement will not support DOLBY ATMOS.