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FWIW, there's no such thing as "too far from the eye", when shooting with a red dot sight - since they have unlimited eye relief.
(Best practice is NOT to look directly through, or focus on, the red dot sight - a shooter should focus on the target & let the dot superimpose itself on the target)
By "too high", I would opine (after mounting more than a few) that he meant that the sight's body would protrude/look too much above the lines of the rifle for optimal handling/sighting - but it could also be a personal opinion, as YMMV.
If the red dot's mounted in the scout position, using the rear bbl sight dovetail or a rail mounted into (some) Rossi M92 bbls (with the factory-prep holes under the rear sight leaf), it's immaterial, unless a really bulky ( usually very inexpensive) red dot is chosen.
Even though my eyes are over 70 y.o., I happen to prefer a set (front/rear) of fiber-optic sights, or a FO front sight w/ a receiver peep sight to a red dot (My $0.02)
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