Your setup sounds good. Great job doing your research.
And yeah, your mom's house, so her rules. And if the rat isn't eaten you're left with a live rat to take care of. On the other hand, frozen rats have to be kept in the freezer - hopefully she's ok with that. Make sure you research how to properly thaw out the rat. And if he doesn't strike at it, just leave it in his tank overnight. Good luck and let us know how it goes.
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