No way to offset the main window to center above the taskbar icon.

[sfatihk]

It's a good feature @Ganoosh .

Maybe, you can use size and margin props.

//...

trayWindow.setOptions({...});

//...

differentWindow = new BrowserWindow(...);

trayWindow.setWindowSize({
    width    : 200,    //optional
    height   : 300,   //optional
    margin_x : 10,  //optional
    margin_y : 10   //optional
});

//..