Some of this is stage dependent and all of it is highly dependent on the team above the product manager. The simplest answer of course is to find PM's from companies who have had exemplary success where the Product Manager candidate either led prior success or was exposed to it in a meaningful way.

A simple starting point is to ask them to give you examples of conflicting opinions on a feature and how they evaluated the conflicting opinions and made a decision and tracked the success or failure of that decision.

AirBnb actually gives PM's homework as part of the interview process where they have to actually present a unique idea (from scratch) to the interviewing team.

Happy to talk to you about best process based on your stage and existing team.