Some marker pile sites are organized with piles positioned along lines which radiate from one or more viewing positions. Often the viewing position is at a hight point and the rock piles are scattered downhill from there. Thus, in the abstract, we have something like this, with red dots for viewing positions and black dots for rock piles:This is a sketch of a site I found this weekend and I am sorry I did not explore that third bump. Note how most of the piles are to one side of the viewing position but with some outliers.
The best documented example of a grid site, which I consider an example of a marker pile site, is the one we surveyed at Spring Hill in Acton, MA
We can look at this with fresh eyes and observe the nearly horizontal lines converging to the right. There is a hight point in that direction but I do not know if it lines up. There also might be high points in the other directions indicated by the families of parallel lines in the diagram.