What I have written here is what I believe, and what has worked for me.But make your own choices and use at your own risk.It also has a lighted switch, so you can be sure if it’s on or off in dark under-the-layout installations, and mounting holes on the back so you can attach it to the layout structure with a few screws.I have a couple of these on my layout, but in a hard-to-photograph location.Layout wiring is fairly well documented, and pretty simple when you come right down to it.But I think it’s worth restating some of the basic concepts as part of this section, as this is what I used as the basis of my own layout wiring described in the Electrical Systems subsection of my Model Railroad section.A long power strip (a four-foot strip with a dozen outlets) is connected to that, and all of the rest of my systems plug into the long strip.
A Good Multimeter - In general the digital ones are better, but an analog meter can work.
Second, if you don’t unplug things when not in use (and you may not want to, as some devices, like wireless throttles, need continuous power to keep from running batteries down) then split your devices into two groups: those that have to stay on, and those you can turn off, and plug the latter into a power strip with a switch, so you can turn off the whole layout.
This avoids running up your electrical bill (those wall-wart transformers use electricity even when the devices connected to them are turned off, and the same can also be true of individual devices with power cords).
This way you’ll at least be protected from some power problems.
But if you live in an area subject to lots of lightning, don’t count on the surge protector to save you; unplug the things that cost a lot when not in use, and unplug everything if you can (a nearby lightning strike can find its way through any conductor, so if some devices are plugged in, it could get to others through the track).