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For the Montauks using the squarish Tempo/Mirax 12 gallon metal tanks, Whaler knew what they were doing as far as securing the tanks. The tank mat raised lip is designed to keep the filled (and heavy) tanks from moving, especially from sliding to the stern or forward. The bungee cord detail shown by Jeff only has to keep the tank from lifting up when light or empty, at which time the tank is fairly light and presents no stress situation that a sound marine bungee cord can't handle and hold down within the mat lip.

The only thing I would do differently from Jeff's photo is to use a single, continuous length of bungee cord, passing under the center eyelet on the boat's deck, with hook on each end. The Tempo and Mirax tanks were built with a hole drilled in the top center lip exactly for this restraint detail.

For plastic tanks of any kind, I would use the 1" marine nylon webbing with SS spring loaded clip style buckle, secured though footman's loops screwed into the deck.