MANY years ago when working along the coast, we had a simple solution for rust problems with small items. Before we knew it as being a piss poor joke on homeowners, we used Water Displacement Formula 40 for its intended purpose.
For those not familiar with the Gulf coast area, there are weeks where it will rain EVERY day... at least a little... and then still curse you with high humidity. Your high carbon tools will actually get a fine coat of rust in a few hours there.
An open truck tool box (helpers), or the tools strung out on the job when you get a quick shower made our tools rust like hell.
We started to wrap up our tools in towels we swiped from the hotels we stayed in that were well sprayed with WD 40. In those towels, they could be rained on and not rust. So we started putting any tools we weren't using in the towels, giving them a quick spritz, and putting them in the tool box.
Then we started to spray the open boxes of nails, and that killed the rust problem on those as well.
FWIW, I had a bunch of hand tools (chisels, squares, dull drill bits that I have intended to sharpen for several years, etc.) that were older, less sturdy, and not "favorites" of mine that I put in a large truck tool box that I pulled off an old work truck. I did the same wrap, and just opened the box and sprayed the towels every six months or so and never had a spot of rust. They stayed in there for about 4 years until I sold the box and most of the stuff in it. Others have done this as well with great success. It seems the key to though, it to make sure you put the items and towels/rags in a container that is pretty well sealed to keep the WD40 from flashing off.
Our average humidity is not so far off Houston as you might think. Our average morning humidity is 83%.
Just a low tech answer. I have no experience with those emitter gizmos. As always, YMMV.
Hope you don't have the tools put up long.
Robert