@Wisdom-: For your use case I can see that making sense I guess. Although you could also use Max-Z-Distance to accomplish the same thing (per your example). If you are doing multiple grids for say a ‘rooftop’, you could create a component tag on the CollisionPlane for a Child BP_Grid_Manager and do the initial line trace to collide with whichever CollisionPlane has that tag as well.
Lots of ways to do it, but I would say stick with what you know works 