UR28M Surround Setup. Possible?

Hi. After reading the operation manual and searching google and Youtube, I have not been able to set up the UR28M to use for surround sound mixing. Ive only seen one video where the person mentions surround mixing is possible. But it does not go deeper than this. Can anyone offer any tips to get this rolling? I use Logic Pro X for mixing and running macOS Mojave.

Second issue but not as urgent is that I can hear input without connecting the device to my lap top. When I try to record and activate the input in Pro Tools, I hear both inputs. How do I kill the input that seems to be coming through even without a DAW open or lap top connected. Thank you!

I am current on all required software.
David

Surround setup is indeed possible. Let me direct you to an old post of mine https://www.steinberg.net/forums/viewtopic.php?f=157&t=75202