on this video, at mark 4:40, the exterior of the two-story building is shown. There is some sort of piping, or vent material that protrudes about a foot or so going up the side of the building. That piping may have obstructed the view from the right-most windows where the snipers allegedly were.
“wouldn’t have been able to see the shooter from where they were*
Then you pick a position where you can see the sweet spot for a sniper to take shots at President Trump. This really isn’t that difficult.