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I just don't see the logic in placing the weight of a large heavy mirror on a handful of pressure points at the edge , particularly considering the G forces that glass might experince if it is dropped hard .
Given an acid free tissue paper wrapping and encased in polystyrene foam sheets inside a wooden box , what is actually going to damage a coating? . Overcoatings are as hard as glass and unless you've got some sand rattling in between your mirror face and the tissue paper it is perfectly safe.
If I were shipping a large personal glass mirror overseas I would look at how the commercial operations were shipping new mirrors , and that is wrapped in flat tissue surrounded by polystyrene foam sheets ( and I have some experience in this) Just my 2C.
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