Rav Belsky zatza”l reportedly held that a Keurig does not require tevila.
Rav Dovid Feinstein zt”l held it does, so the only eitzah is to have it owned by a guy.
BTW, there are opinions that something that is only used when plugged in is considered attached to the ground and does not need tevilla.
Minority opinion. R’ Moshe zt”l didn’t hold of that.