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That article is about rig cant to ground...... not scope cant to rifle, the scope to rifle will remain paralell as long as the verticle wire of the scope is in line to gravity (plum to ground,...

You would have to have a seriously out of cant scope to rifle to throw it out more than 10mm to one side of the line of sight... If it looks right to the eye it will be fine (rifle/scope cant)
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Another way of thinking is the Gravity determins the drop so as long as the scope is level to the earth (verticle not level to the slope of the ground) the amount the scope is out to the rifle is...

Cant remember who showed me but lately I have used the line on a card method... Place the card on the ground with the line center of the but pad and sight back down thru through the scope so the line...