Those places are usually career dead ends anyway, even if you're not bothered about working remotely.
Unfortunately, there are many places which only have employers like that which means you either move or you deal with it.
* What hours did you and your team work in the last month? (anything that indicates long hours are frequent is a red flag, not because long hours are intrinsically bad (though they are), but because it's usually being used as a proxy for measuring productivity).
* What is your policy on remote working? Who do you have remote working currently and under what circumstances? ("no remote working" is ok for me if there's a non-bullshit reason but YMMV).
* Who is currently your best or one of your better developers? How did you come to that conclusion?
* What characteristics do you look for in clean code vs. technical debt-laden code? How do you handle and plan for paying down technical debt?
* Who reads your team's pull requests? (worst answer is "nobody", 2nd worst answer is "the team").
* Have you read any of my code? What did you think?
I'm usually not looking for a perfect answer to all of these questions, just avoiding the companies that give an impression of widespread systemic dysfunction in their answers or a manager who is clueless.
I never thought about teasing the red flags, but it makes more sense than just asking directly.
You could publish a list somewhere, I think a lot of people would find these valuable.
How did they work for you in practice?
Best/worst reactions to them?
What's the best answer you've heard for this one?
Teams are composed of individuals, and we've set up things so that if the team doesn't depend on the knowledge of one individual. However, we still have people working remotely and the engineers are valued because they create value, not because they hoard knowledge.
But how feasible is it to do this today when so much of the current crop of advice seems to be teams-over-individuals, nobody-is-indispensible messages telling managers to avoid letting programmers gain this kind of leverage at almost any cost?