North1,
What I did was use aluminum plates to shim up my safe on the concrete floor in my garage. I then used self tapping screws to attach the plates electrically to the safe and so far it's worked really well. During the winter months, I usually have at least 1 inch deep of a mixture of salt and slush on the garage floor so I knew it would be almost impossible to keep the safe away from the corrosive mix so I decided to try using the anodes to control what corrodes. This is not the best application since the structure isn't completely buried in earth or submerged in water but I figured it would work best when the conditions are worst and that appears to be what has happened. Magnesium and Zinc are better metals to use for anodes with steel but there are certain aluminum alloys designed for use as anodes.
For the desiccant, I've just been buying those closet dehumidifier packs you can buy at Walmart for around 3 or 4 bucks:
http://www.castlewholesalers.com/WIL...ier-6-7oz.html
The closet desiccant packs are nice because it's easy to see when all of the crystals are gone and you just have liquid left but I do have an Eva Dry as backup. Someone did monitor the humidity in their gun safe over a period of time and the desiccant kept the humidity at around 40 to 50% which is the ideal level for me. Edit: I missed the size and safe brand question, size 36Wx27Dx60H Sturdy Safe.