Is an additional hanger required in the 20" of pipe mentioned? Certainly.
But, these 2 hangers do not need to be less than 2 feet apart. They can be
spread apart. Half the max allowable distance? end of line hanger
spacing/pipe size would not apply once that armover is hung, right?
As for the hanger assembly limiting the upward movement, I never noticed
this discrepancy before. Thanks for pointing that out. I was taught to
always have my rods 1/4 inch from pipe on all armovers and ends of line.
Even before cpvc made the issue commonplace. I rarely ever saw those
hangers with the foot-type thing that covers the end of the rod. They
should have been mandated. Lots of damage done to cpvc pipe by sharp rod
ends, stiff-rodding, vibration, expansion, etc.... But that is another
thread in itself.

Thomas
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