I've this arrangment of screens, and I've set the dock to stay on the left side.
The problem is that the dock goes on the second screen, while i want to keep it on the main one (the one with the white bar basically).
With the screen arrangement below you can accomplish what you want. However, with this arrangement it is not that intuitive to move with the mouse from one screen to the other. I have my MacBook sitting to the left of, and slightly lower than my monitor so it did not take too long to get used to it.