The U.S. Constitution gives state legislatures the responsibility for assigning electors for the Electoral College vote. If election officials in the sh!t-hole counties of Florida and Texas, for example, refuse to certify their results, then they do not have the power to undermine the entire state's EC results.
I think a lot of these discussions are going to diminish in the coming weeks as it the composition of the House of Representatives becomes less certain. The GOP does not even need to win an outright majority in the House in order to win a presidential election that gets played out in the House in the event no candidate gets 270 electoral votes.
Those electoral votes are assigned according to who won the state (voting). The counting of the votes is where the Democrats will try to steal it, with the help of mail-in voting that allows them to manufacture the votes that they'll need in the swing states.