Life is Strange and MGSV are the only 2 I've come across so far with 21:9 issues. There're simple fixes for both of them though, Life is Strange you just run a utility exe, MGSV requires a fixed .exe for the resolution then another file to fix marker positions. Basically any issues you come across there's usually a fix on wsgf forums.
As to monitor position, mine's boxed up ready to be RMA'd at the minute but the screen sits very forward on the stand. I think the legs poke over the front by 5cm or so but the rest is behind -- like I said though, because you're putting it in a corner it shouldn't be much of an issue. The overall width of the monitor is going to dictate more how far forward the monitor will be I'd imagine (assuming there are walls at the back of the desk?).