QML - Windows - Keep a Window in the bottom right corner of the screen

I want to keep the window of my application in the bottom right corner of the screen.

According to the Qt documentation this should be simple : 

Ref.:
https://doc.qt.io/qt-5/qml-qtquick-window-screen.html#desktopAvailableHeight-attached-prop
https://doc.qt.io/qt-5/qml-qtquick-window-screen.html#desktopAvailableWidth-attached-prop 

Unfortunately the above doesn't work under Windows in multiple cases : 

1.: When I am using multiple screens, and the screen alignment is configured like this : 

I get this result :

This is caused by the above `desktopAvailableWidth` and `desktopAvailableHeight` properties giving back the bounding rectangle of all the screens combined.

2.: When I attach an external screen to my laptop, and configure the external screen to be the main screen

=>
the window disappears. (I guess that it is positioned somewhere outside of the screens.)

I attached a sample project which could be used to reproduce the above issues : PinToBottomRightTest1.zip

What would be the solution for keeping a Window in the bottom right corner of the screen?
The solution would need to work on macOS and Windows at least.
The solution should also work in multi-screen environments.
Bonus : I would prefer to keep the window always on the Primary Screen.