I don't mean to throw shade on Goodnature, but I have used these extensively for my profession. I know I will upset some people when I say this, but they're a very expensive gimmick. They will kill rats, no doubt. But I have done some baiting trials with them on an island in Southern California and in the Mariana Islands using cameras to record kills/visitation and it's less than 1%. Nobody sees how few you are actually catching compared to how many come take a sniff because they just see bodies or a number on the hit counter. But that's akin to what someone said at the beginning of this thread, where you see one dead rat under an A24 there are a dozen that have been sniffing at the thing all week and they're all too wary to stick their head up there.
Again, not saying adding one of these won't help, because diversifying your methods is a good way to maximize captures. I'm just speaking from experience. I captured, tagged, and recaptured over 700 black rats for my M.S. and I settled on live traps with coconut because that was the most effective trap I knew. Maybe that's by bias