This doesn't help productivity. I used to use three screens, but I've found it's less efficient than two screen, then virtual screens that you switch with the keyboard. Less head movement means more productivity. Which is the same concept why touchscreens don't increase productivity, and learning keyboard shortcuts does. Touching a screen < moving a mouse < keyboard. Moving your head around < moving your eyes around.
If you really want to be productive, learn a tiling window manager, like xmonad, ratpoison, i3, dwm, something like that. A second screen is good as a "non-primary" board. A third screen is useless, since you can just define it as a tile you hide on your "non-primary" board.
I've extensively studied this, gimmicks like this app will never improve workflow, and VR will never really be used in productive work, despite all the wonderful hype it's getting now.