One-on-one private closed door meetings are risky for many reasons, including assault and false accusations of inappropriate conduct. I do not do them, but if I was forced to meet in private, I would install a system like SimpliSafe that can record video and call for help at the push of a button. Unfortunately, folks attending private counseling sessions likely won’t want to have a camera pointing at them.
In my experience, threatening office encounters are virtually certain to happen on a regular basis. It’s not if, but when. I can’t carry at work, but have a Mk. 4 can of Fox taped under my desk. I always have a folding knife. But… I am a lifelong student of the self-defense arts. If this was my wife or daughters, I would recommend no meetings in private without backup.