Some things to keep in mind:
Be ready to encounter candidates that don't cleanly fall in line with how your company imagines the role.
Shortlist generously.
Ask situational questions regarding prioritization & product decisions. See what questions they ask, what angles they uncover.
Also, have they explored your product & pointed out something you didn't know? Great sign.
What product do they look up to & why? Have they noticed something non-obvious about it?
As a Product Manager, you might be asked a lot of questions during an interview. One of them includes technical questions. Here are 4 types of technical questions that you might come across.