One thing to keep in mind is there are different types of products people use for this purpose. A “hot plate” in my mind is something meant for cooking (which can get really hot), while a “warming tray” is only meant to warm something up or keep something warm. I had one of the latter, which never got above 200 degrees, and it seemed really safe (we used it for three day yom tov with no problem), but they don’t make it anymore. Some things sold for Shabbos use actually get extremely hot, and for that reason alone can be dangerous.
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