Does this need to be installed directly above the spot you want the laser to "highlight?" I know it rotates, but I assume that's in a "top to bottom" rotation, as opposed to "side to side?" Sorry I'm not being more clear; just having a hard time picturing how it could provide a straight-down laser seam guide if installed off to the side rather than directly above the desired seam location (I don't know if there's a flat space for installation above that location on my machine body, which is slightly curved in that area).