Vertically arranged multiple monitors: some apps won't let me drag them "above" the menu bar
You are able to choose which monitor will have the menubar in the 'Displays' section of System Preferences.

Go to System Preferences, click 'Displays', and choose the 'Orientation' tab. If you click and hold on the small white rectangle signifying the menu bar, you can move it between screens and move it to the top most display.