Hi Chris,
The centre mid-point on an object is used as the reference for Animation Paths. You can try using 'Relative' or 'Absolute' on the Animation Path. The desired type may help you set up your positioning vector.
You probably know, but if you right-click on a path in the editor, it will give you the option to "display the path in Preview". (you can also reverse the direction of the path)
The mid-point of an object is displayed in the status bar as Mid(), which displays the x,y position on the page.
Hope this helps.