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By "stack", do you mean one on top of the other so that the air flow from the first goes through the second? If so, then I suppose you can do that, but it may be that using just one is just as effective. The reason I say that:
Air-to-fluid heat exchanger effectiveness changes with air flow and temperature differential. The amount of heat can can be removed is proportional to the mass flow rate of air and the temperature difference of the air entering/exiting the cooler. Stacking the coolers reduces the air flow through both (air resistance increases) coolers. Stacking also changes the temperature differential; you're effectively feeding warmer air to the second cooler.
Do you have any technical data on the coolers? I may be able to do the math for you...
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