To keep guns pristine, it really depends on:
Where you live. Santa Barbara or Anaheim or Big Bear or Palm Springs are all in So Cal, yet they all have wildly divergent climates. Humidity, daily temperature extremes and salt air all can cause issues with metals, there is no guarantee that even DLC coated slides can’t possibly rust without some level of assistance from the owner.
How often you maintain them. If you buy the gun then store it immediately, your gun may have sufficient corrosion protection applied from the factory to last quite a while. If you handle and put it away without wiping down with an oily cloth or other protective action, as the guys said your skin will leave acids on the steel that will rust over time.
How you store them. If they were my guns being relegated to safe queen status, the last place I would store them is in egg crate foam containers or plain cardboard boxes. Every time my guns are carried in egg crate lined hard cases I can see the discoloration on the bluing as the foam touches some areas more than others. Humidity or other moisture that gets inside will certainly be held firmly in place against the steel of your guns by the foam. Plus, over extended periods egg crate can decay and become either dry and dusty or oily and mushy. Cardboard absorbs moisture and has acids and chemicals used to make it, soft gun rugs and long gun cases are magnets for moisture. Leather holsters are the worst, keep a gun in one of those for too long and you're sure to see the finish get damaged (My 2.5” Model 19 is living proof of that.
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For a safe queen, I would get a real safe with a dehumidifier and store them in as climate-stable area of my house as possible using polymer coated metal racks or or polymer coated metal rods in the bore to support them. Very few of my guns aren’t shot at least once in a while, and those that aren’t are still handled and wiped down on occasion.
You have a few nice ones, good luck finding the solution you need.
Stay safe.