Anything above Biden +12 and we're seeing 413 EVs as an absolute floor. MI, PA, WI, FL, NE-02, AZ, NC, GA, OH, TX, ME-02. Biden +15 is the territory where we could start seeing a handful of SC, AK, MO, IN, MT, KS.
I wonder if Biden could win 2 CDs in NE while still losing the statewide vote.
Winning NE-01 is just barely possible in a Biden landslide. NE-03 is impossible (Trump won it 74-20). So yes, it could happen.
EDIT: It's mathematically easy. Trump won the state by 25, NE-01 by 20, NE-02 by 2, and NE-03 by 54. Do a uniform swing of 22 points to the left and Biden wins 1 & 2, but loses the state.