Can't say with 100% authority but since the Carpet goes in after the Pad,
I have always installed it over the Pad.
The plastic Foot shield/guard at the base of the column is what prevents the Carpet from rolling over/down.
Right or wrong never had any issues.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
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