Package project to run on multiple monitors

Hello unreal folks!
I am trying to package a simple project that should run on multiple monitors, excluding the main one.
In Windows settings I have the main monitor all the way to the left, and the others (that the project should run) aligned right to it
In PIE I can do that just fine, giving the window height and width as the total of the monitors, and giving 1600 as left position of the window (main monitor is 1600 x 900), but I don’t know how to package it with these settings.
I tried editing config/DefaultGameUserSettings.ini, but it seems to ignore the WindowPosX, Y, ResolutionSizeX and Y. Only thing I can achieve is changing fullscreens/windowed with Fullscreens ode
Any clue?
Thanks!

I am looking to solve the exact same issue. I tried editing config/DefaultGameUserSettings.ini, but that doesn’t seem to be working for me either. Please let me know if you were able to solve this problem.