I’ve been working for almost 10 companies in 20 years, and I have only found 2 drama free workplaces so far. It’s random and I don’t think there are signs that could show you whether a job is good or bad.
Most HR people are happy when they hire you but it usually means nothing, sorry.
Last but not least, drama free could also mean “we’re gonna fire everybody in a few months,” which makes the choices more difficult to make.