Suggested by ATP Munich office
Column Location Mark should always show the distance to the axis of the grid, if it is not placed in center.
Column Location Mark, in the column options can show on what grid columns are placed. It will also show the distance, if a column is off grid.
But if the column will touch the grid and is not centered, there will be no way to see that it is not in the axis.
Here 3 scenarios:

Yellow is on axis, that is all fine:

Green is touching the axis, also fine:
And blue is not on the axis, but showing no distance.
But there should be the value displayed, that the column is not exactly on the grid.
