I have installed this game 4 times now. I end of having to play in single monitor because the setup is next to impossible. This is so damn frustrating. I change the pixel width and go to set up the right monitor, go back to make sure of the settings and it changes the pixel width to the physical height... This truly is so frustrating. I want to love this game, but i end up looking at my other monitors in frustration and uninstall. I thought for sure if i gave the developers time, they would simplify it..but nope. uninstall.
The video above is the same which solved my problems. To avoid the problem that the game constantly changes your inputed data, you should close the game and open the triplescreensettings.xml and adjust all your data there. Afterwards the correct data will be displayed ingame. (atleast it did for me)