How can I position the mouse cursor relative to a Floating Menu?

How can I position the mouse cursor relative to a Floating Menu?

I think this would be broadly useful. In my case, I want to return the mouse to the center Trigger in a Floating Menu that has 3 columns and 5 rows of square Triggers. I have been successful at keeping the Floating Menu in place relative to the screen, and could use Screen X, Y to position the mouse cursor where the center Trigger of my Floating Menu should be (itself prone to fail when using multiple screens), but I think it better to position it relative to the Floating Menu itself, just in case it gets moved.