I started a thread on the Steam forums as well - but it may not be worth the time of our fixers (unless there is a BIG demand). The game appears to be terribly optimsed, and after you get out of the area in your screens, even the next area you can see the terrible performance. Sli is a no go, as it's doesn't have an official profile, but more importantly, it doesn't run fullscreen exclusive - its borderless window, so Sli is disabled, even though it might show it uses both GPU's.
So the game would have to be optimised and run in proper Fullscreen, then you might be able to get Sli running, THEN the game might actually play across 3 screens. It's much like Evil within, that game is somewhat unplayable on triple screen.
http://steamcommunity.com/app/237850/di ... 452887754/