Turkey hollow and train friends, I am going ahead with the PSX-1AC units. I got 4 of them and the sonalerts for them. I am currently working on 2 tunnel entrances and don't want to stop to go back to wiring right now. But I should get to them in a week. They sure don't protect anything if they're not hooked up!
I am probably the clumsiest person you'd ever know and I expect to have plenty of problems with shorts and "doing the stupid" thing. So I need a system that looks out for me. I think these will be a good addition to the toolbox.
Thanks for everyone's replies and contributions to this thread. This has been very valuable.