I have used mine just sitting on a cabinet and with blocks or legs under the unit. The ultra is a bit different than the plain Arc in that respect.
I’d start with the sales page and user manual to see if any of your information can be found there.
https://www.sonos.com/en-us/shop/arc-ultra
https://www.sonos.com/en-us/guides/arcultra
That’s great, thank you. I currently have a tv unit that’s fractionally shorter than the total length of the Arc Ultra. I was concerned that if it had feet on the underside, they may be partially over the edge or even completely outside it’s total width, particularly if they were small profile feet.
appreciate your assistance!
The bottom of the Ultra is flat so unsupported ends won’t be an issue.
My legs are in about a foot from either end and I have no issues.
Thanks again, really appreciate your help!