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There is always hunidity in the air, nothing you can do to mitigate that. If you seal the mount inside a plastic bag it will corrode in some way. Ventilation is the way to go for sure. Dry it off as much as is practical then seal against ingress of bugs and nasties, breathable bottom cover, and allow circulation to dry it out.
Keeping the ground moisture away is the correct procdure. Are you placing a sealed base around the mount ?. Pavers or similar ?
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