Higher mounts can give a flatter curve on the longer ft tagets, so less clicks and thus if you mis range more chance of a hit by not dropping or being to high, wind not an issue. slight down side is more clicks at low ranges.
Lower mounts usually more for Hft ranges to give a nice flat curve around 15 - 35 yards, though i know some ft shooters that do well with lower mounts.
Try a set up up with both, but remember to go high if going high.
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