I would use a couple of straws just to be safe. I would also use a dowel to keep it from leaning or it might come unattached. You could put a little 5" round of wax paper on the cake before sitting the “appendage” on top but make sure to dab a little buttercream or royal icing on top of the paper before placing the “appendage” which should be on a 5" board. This will keep it from taking the buttercream off when you remove it. Ouch! :)
