Thank you that was just what we needed ! No i think the other way around does not make much sense. After we confirm the mesh to its current snapped location on the instance static mesh we just call the actor it snaps to and say that we want a new instance there or we just create a new instance static mesh (actor) all together. But perhaps someone could find use for the other way around but i haven´t think about scenarios where this might be needed. Perhaps to snap two instance static mesh groups like a house and a carport, as an example, together ?
Anyway, you are awesome, thank you for your quick respond and fix / update!