Ok. So my Uniheat small pet shipping warmers have arrived, and just in time, as we're due for a Nor'Easter here over the weekend and tend to lose power every time the wind blows, which is why I got these buggers. So, they do come with instructions, but for shipping. How would anyone suggest I use them to keep my snake warm in his habitat if the power goes out? Would it be safe to just wrap the warmers in towels and place them inside the terrarium?