My wallet is too thin to do any harm.I had a really good chiropractor years ago who told me the best thing I could do for my back was to stop keeping my wallet in a back pocket. I still go from time to time for adjustments, have had lower back pain for most of my adult life. Being 6 ft 7 in tall doesn't help, always having to bend over to work. I had a really good physiotherapist for a couple of years that also did acupuncture with amazing results. Unfortunately she moved away and I haven't found another one yet. Most of my pain is in the right hip area, walking helps me a lot, so I try to do as much as possible.
Mine looks something like that. Got it off Amazon. Easy to adjust, but at 230 lbs it will put some stress on my ankles if I really lay it back. That one looks like it may have more comfortable ankle cuffs. Think surface area. You don't have to go full vertical to get results. Better to ease into it.