On ours, the toppers on each end have 2 rubber stoppers on the bottom so that the top won't just slide off the table. I believe they're also magnetized.
Make sure you have enough clearance for any items you want to store in the table, and that they won't intersect with the stoppers if you add those.
From my experience:
It depends on the therapist. Ultimately what I got out of it is heavily based on what I put into it. If I just showed up and said everything was fine when it wasn’t, that obviously didn’t help. If I didn’t do the “homework”, that didn’t help. If I was bullshitting and the therapist knew I was and didn’t call me on it, that didn’t help. At one point I was struggling with religion, and having a therapist say I just needed to pray more didn’t help.
It can be, but if you have an understanding of what you’re looking for it can be helpful. For example:
Don’t give up if you don’t find someone immediately, it can take a few to find one you vibe with. Best of luck!