Raycast Info

Hello everyone,

I have made this model, with the points, as the instance points, in Geonodes. I also want to have points on the bottom of the object, which will be related to the points in the pic. I am thinking a raycast from the points in the pic, to the bottom of the mesh (can be separated from the rest). Is this the best way? What should i rather use? Does anyone have any good raycast tutorials? Thanks in advance.
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are you looking to drive some spikes to hold your rail in place?

raycast would work, but probably be overkill. what is the ultimate use case?