"Rules" not really, just consider that water and steel create rust (I don't think you have a salt system) and that only speeds it up that much faster!
Just either have smooth/covered/feet vs. sharp metal on the surface touching the pool body to prevent any damage. Remember the pool is concrete so it's tough overall.
Just either have smooth/covered/feet vs. sharp metal on the surface touching the pool body to prevent any damage. Remember the pool is concrete so it's tough overall.