"Does it just lay on the bottom of the safe?"
Yes, on two little snap-on plastic legs.
"How "warm" does it get?"
You can touch it, but not for long. I keep it an inch or two away from stuff and have never melted or blistered any plastic gun stocks or the carpeting.
They come in different lengths, use the longest one that will fit horizontally. I think they still make some model with NON-detachable plugs. It makes it hard to feed the wire through the hole in the back of the safe. All of the ones I've seen, and my 3, have detachable plugs.
http://www.drytheair.com/xcart/store..._12_Watts.html
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"40 to 60% is more the norm."
Geez, that's so dry I'd probably get a nosebleed.
