Hi Veronica,
In a case like yours, I suggest you use the “space” tool instead “Spline wrap”. Just before that, make sure that the Spline that you have has a large number of points spaced at the same distance. You can get that by converting the line type to “uniform” and increasing the value of the number of points, copying the line by “current state to object” and then Delete the old Spline
When using the space tool you can easily change the offset to make the line elevate over the map level, you will find an illustration of this in the screenshots below
Hope this helps