There is a reason why many of the old timers hold the strop at about waist level and have their anchor lower than waist level. Such a setup requires a minimum of out of plane shoulder and elbow movement and is more fluid and natural in practice. Pay attention to the quiet shoulder and elbow of Liam Finnegan in this video.(Ignore the floppy strop) Try it yourself and compare it to how much more shoulder and elbow movement is required in other positions.