Best way to mount rod holders on 15' aluminum boat?

BYDOT Flush Mount Fishing Rod Pole Holders 15/30/90 Degree Rod Holders for Boat Yacht

Best way to mount rod holders on 15' aluminum boat?

Flush Mount 15 30 90 Degree Boat Fishing Rod Holder - China Kayak Fishing Rod Holder, Flush Mount Fishing Rod Holder

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Flush mount fishing rod 30-degree angle, made of polished Stainless Steel 316 high-quality, heavy-duty units with solid cast frames for superior

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Best way to mount rod holders on 15' aluminum boat?