Those things from labsafety are definitely and obviously intended to be mounted on a wall. You are talking about putting them on a BOB. My understanding is that putting them on a BOB is illegal and putting them on the wall is legal only if you notify the NRC of the exact location. There are some specific portable devices like gun sights and watch dials for which tritium is approved, but I don't remember BOBs being on that list. I'm going by some CPF threads of a while back that appeared to be well researched, but I didn't care enough to go and chase down the references in those threads. I don't see the things as terribly dangerous. They're sold publicly in other countries including the UK, which is not exactly a country that courts danger (see the thread about the UK kitchen knife ban). So if you're using them, it doesn't bother me, regardless of whether the US government approves or disapproves. I'm just telling you the situation to the best of my understanding.

I'd be interested to know if your markers arrive from labsafety. If you have further questions about the legality you might contact labsafety or the NRC. If you're reluctant to do that, maybe you're not so sure of what answer you'll get.