You'd need 2 x vectors to compute the vertex normal so that won't work. If it's just to place objects initially , set the terrain to entitypickmode 2 , and do a linepick straight down, then aligntovector entity , pickednx, pickedny, pickednz , 2 and position it using pickedx, pickedy and pickedz.
Blitz Terrain/Align Mesh
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