Exactly what I was looking for

What a fantastic app. I have a MacBook Pro, Thunderbolt Display and iPad Pro (connected by DuetDisplay). I loaded in a big picture, the system already had my three screens layed out properly. A couple of clicks later and it even applies the wallpaper itself. Had to do a bit tweaking up/down/left right on the displays relative locations to get them lined up, but all the tweaking I needed to do is supported in the app and can be applied and tested in few seconds. Couldn’t have asked for a better app. Nicely done!!!

Penage about Multi Monitor Wallpaper, v1.50