The multipliers sharpen the results, which I wanted for my map, you don’t necessarily need them, and there may be a way to replace them with something else.
Simply type WorldPosition, it’s under coordinates. Yours will look a little different than mine.
you did the dot function first, yes? I’m not sure why you need to divide that high. My test map’s landscape was aligned at 0 on Z, btw. If your landscape is below there, you’ll get different results. As they’re present across both the negative and positive values of the Z axis. Also, my test map stretches to the heighest point UE4 will support, which may be why my results don’t need such a large divisor.