How to make game window to be in the right place on screen via command args

Development Character & Animation
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1

I’m trying to run 2 game clients with script below:

@echo off
start Game.exe -windowed WinX=10 WinY=10 ResX=800 ResY=600
start Game.exe -windowed WinX=900 WinY=10 ResX=800 ResY=600

But all time all windows stuck at the center of screen after being properly set up at positions in script.
Resolution works fine but not position.

Seems like the game window is forced to be fullscreen in UE4.16+

Also, config settings in DefaultEngine (below) doesn’t work.

[SystemSettings]
fullscreen=false

For test purpose I used blank blueprint-based project.
Same behavior in UE4.17.2 and UE4.16.3 but not in UE4.15.3