Coordinates of line-based Revit elements
First, check that the elements you want to report coordinates for are indeed curve-based or line-based. This means you place them by clicking two or more points instead of one. For example, a slanted column is line-based while a standard vertical one is not.
Second, open RV Live Coordinates and create 2 parameter links for the same category, for instance, “Structural column”.

Next, verify that each parameter link will write to a different set of element parameters. You wouldn’t want them to overwrite each other.
Then, set the first parameter link to reference the elements’ start points. For the second parameter link, use the elements’ endpoints. If the element is slanted or vertical, you can also try the upper or lower endpoints.
Finally, click Apply. RV Live Coordinates will detect, record, and keep the coordinates of each element up to date as long as you have Live Update mode on!