Definitely wouldn't use Atlanta. Road teams in general are bad in survivor pools (unless you have to) and St. Louis has actually been pretty tough at home.
Would stay away from Dallas too. Two schizo teams here; either could easily win or lose by 30.
Both other ones should be safe. I'd lean to San Diego because there's probably at least as good of a place to use NYJ later on (Thurs vs Cinncy, 12/12 vs Miami, or 1/2 vs Buffalo) but unlikely to be as good of a place to use the Chargers.