How to set guiobject to exactly on top of another gui object?

Hello everyone, I am trying to set a gui object to center exactly on top of another gui object. However, when I set both of their positions to the exact same (I am using scale instead of offset), there is a slight difference. I think this is due to them being parented to different frames, but I am not sure how to fix it. I have checked to make sure they have the same anchorpoint.

Here is my current code:
Illuminator.Position = GuiObject.Position
(doesn’t work)