I think for that kind of setup you have to specify based on pixels directly rather than relative. I think the "-pos" argument and you give the coordinates. It c

I think for that kind of setup you have to specify based on pixels directly rather than relative. I think the "-pos" argument and you give the coordinates. It creates one giant virtual display (it's always a rectangle) that can accommodate the total resolution of all your displays so you might have to do some math to get it how you want. You could also try one of the GUI front ends to make a config for you like arandr.