About desktop there are 2 possible settings either individual screens or connect them together as one desktop screen.
i use 3 screens in 2 different monitor size (two 19 inch and center screen 24 inch) for this scenario bind as one desktop like surround view
In the sim i setup multiview with mainscreen and left and right view in windowed mode
So one view for each monitor.
My question is have anyone tried it from here like this, and see this link
I posted on another topic earlier this week.
Hope this can help.