In version 7.3, the Family Instance Location Node locates the points off of the surface and are incorrect. I have tested this many times on various surfaces and curtain panel/adaptive components. It worked in 6.3. See attached image comparisons…You can see with the first image how the points are correct in 6.3 but in the second image the points are not even on the surface when using 7.3. Can we get a fix to this?