Section views got their own coordinate systems, you can check what direction is to the right for the user with the RightDirection property and use that vector to determine the offset,
import clr
clr.AddReference('RevitNodes')
import Revit
clr.ImportExtensions(Revit.GeometryConversion)
OUT=IN[0].InternalElement.RightDirection.ToVector()
(UpDirection and ViewDirection are similar properties)
http://www.revitapidocs.com/2017/be253fe5-777b-11b6-02be-64106cbb713f.htm