That's the hard way.
Go to the Label Style Composer.
click on the Dragged State Tab
Expand the Dragged State Components
Go down to leader attachment
Select Top of topline or Bottom of Bottom Line
The only down fall to this is that in plan it will usually decide which line is top and which is bottom on it's own making it a pain if you want it on the other side. and in profile the same thing can happen from time to time.
they may have fixed this in 2008.
R10 - 2020 ACAD
2008 - 2020 Civil 3D
2014 - 2020 Plant 3D
2014 - 2020 Revit
V8i - V8i SS4 Microstation
Infraworks
2018-2020 Inventor
2020 Navisworks