Using secondary monitor

Hey guys, I have two monitors a primary(small one) and a secondary(bigger one).
When I start the wotlk client it always starts on my primary monitor - regardless of it being windowed or full screen.

Is there a way to start the client on my secondary monitor?

I'm guessing it's with some setting in /WTF/Config.wtf like `SET monitor "2"` but I have no idea.
Moving the game doesn't work because of the size difference of my monitors and tbh I don't want to move it every time I start it.

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https://forum.warmane.com/showthread.php?t=411043 - the "solution" here doesn't work for me