Im not a professional umpire so I cant speak to where he should have been standing but from his vantage point it certainly didn't look like the view in the video.
I don't believe there has ever been a call reversed by the Commissioners office, but if there has and a precedent established than this call will be overruled.
His angle was good. It's a tough call because you have the throw coming from the second baseman and you're looking for a 90 degree angle on the throw. The runner though will run you over, so the ump will slide down the line and a little to the outside to let the runner go by. This guys was very close to the line as I recall.
It's usually not a tough call even when close, because you have two feet competing at the same small spot. As they've been saying, the umps get this one right 999 out of 1,000.