As it would take both a House vote and a Senate vote to accept one of these challenges, all of this is just an exercise in symbolic gestures.
With a two hour limit on debate, multiple challenges could run out the clock and throw the decision to the House where each state has one vote. You are correct that the initial debate in the House would never provide President Trump a path to victory but the object is not to win but just delay until Jan 20.
Loeffler is a total fraud!