My tank rests in a carpeted room, so I bought a plastic carpet runner from Menards and placed the tank stand on top of it. Most splashes have been caught that way, and when I'm going to be especially enthusiastic about my maintenance, I place some towels around the floor as additional protection. That said, I know I've exposed my carpet to enough saltwater, but since it's SALTWATER, primarily that just means it gets wet and salted, and ultimately just salted. Cleaning regularly enough is still advisable, as is sponging up spills, but thus far my carpet has shown no worse for the tank's presence. Anyone else seen signs of saltwater damaging conventional, synthetic carpets?
One of my bigger concerns was the wall behind my tank. If you're setting it next to a wall, make sure there's enough distance between your wall and your tank. My skimmer especially had a habit of spitting gunk against the wall if I let it overfill--I was able to attach a protective sheet of plastic to prevent that.
rusty