Using 1080p monitors with 4k monitor xrandr command

I just got a 4k monitor to supplement my two 1080p monitors. However, I am having trouble getting the scaling working to everything looks good. The monitors are physically set up like this: ____ ____ | DP1|____________| DP2| |1080| 4k |1080| | |_____DP3____| | |____| |____| Looking online, it seems like using xrandr along with --scale and --panning to get everything scaled and lined up correctly. However, I am trying to follow what I've seen and can't get it working. The command I am trying is: xrandr --dpi 163 --fb 11520x6480 --output DP-1 --scale 1.5x1.5 --pos 0x240 \ --rotate right --panning 2880x1620 --output DP-2 --scale 1.5x1.5 --pos 4920x260 \ --rotate left --panning 2880x1620+6720+0 --output DP-3 --mode 3840x2160` When I execute the command, my 4k monitor looks fine, but the 2 1080p monitors seem to kind of mirror an area around the mouse cursor. With everything messed up like this, I am unable to open a terminal with the keyboard shortcut, so I have to reboot the system to get to a stable state. I really appreciate any help with this.