I've been messing with the isometric grid object 2 and I was wondering how I could go about setting an object to be at the top of the highest point on any given row/column.

What I'm trying to do is have a selection box always go to the top most level of the current cell... So that when I have a map with various levels of height, it's always putting the object at the "top" of the current column/row that it's in.