I'd go for the double boiler method, even if you have to improvise one given your larger amount of potatoes. Be sure you have a lid of some kind and your mashed potatoes should stay moist.
If you aren't using your microwave, they're usually a small air space with good insulation; a big pot of potatoes would stay warm in there for quite a while.
I also suggest these mashed potatoes as another option, which can be made-ahead and reheated whenever. https://food52.com/recipes/38993-silver-palate-s-thanksgiving-potatoes
If you don't want to reheat them in a casserole dish in the oven, you could keep them warm in a pan set over simmering water as Ina Garten recommends: https://food52.com/blog/11742-ina-garten-s-make-ahead-thanksgiving-advice
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