The one that's buried underground with proper shielding and an air purification system with blast shutters and 6 months supplies for 4 persons inside.

All of the "makeshift shelter in your home" B.S. is only going to create a bunch of folks who are dying slowly of radiation poisoning.

Build a proper shelter on your property, OR, find a proper shelter that you can get to and into.

I'll leave the exact "where" to you as you know your area.
But I will suggest basements of buildings, garages, hospitals, and old fallout shelters.