Hi Beth,
It looks like the one Marvin referenced clamps directly to your stretcher bars, in which case, it could be placed anywhere, but might not be usable if you paint on panels.
The eraser on the tip of my cheap version does a few things. On dry paint, the rubber "grabs" rendering it non-slip. Or you can rest it on the edge of a wet painting and the eraser "grabs" the edge of the painting, keeping the stick off the wet paint. Finally, it does help keep abrupt and accidental motion of the mahl stick end from scratching the surface of the painting.
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