Height of 3D Marker

Hello!

I am having difficulties setting the height of a 3D Marker. We have a map on which a player can walk and it displays objects based on data (for example high object for high danger level). For this we decided to use the 3D Marker because it works with latitude and longitude.

I've tried using either a 3D vector instead of 2D or setting the altitude manually, but they still appear at the origin of the Y axis.
Example:
// Marker position. Geographic coordinates.
            Vector2 markerPosition = new Vector2(Random.Range((float)low_lon, (float)high_lon),
                                                 Random.Range((float)low_lat, (float)high_lat));

            // Create 3D marker
            marker3D = control.AddMarker3D(markerPosition, markerPrefab);
            marker3D.scale = 20;
            marker3D.altitude = 1000;