Placement System on multiple objects?

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1

Title says it all really. I was wondering how would I extend a placement system in a way that it is able to move up onto multiple surfaces as seen in this gyazo:
https://gyazo.com/c7ef7d8e7a98be9b1782f4d8442e9bd0

I have managed to make a system where it is constrained in a border and moves fine, but this is just one thing I have no clue about.

Note: I have read SOME other posts about this thread that were not an exact answer or just didn’t help my problem because they were confusing.

2

all you have to do is to get the 3d position of the mouse. after that you can set it’s position to that 3d position