I don’t know if it also happens to you, but I always have this fear (not only the equipment but also the whole freaking house).
I have two Synology NAS devices and one “custom” server (just a PSU, a Ryzen CPU, two RAM sticks and a SSD).
Everything is grounded, on a compliant safety electrical installation, but I don’t know… I’m maybe paranoiac by nature.
My biggest doubt is about the PSU. It is a certified PSU (from Be Quiet! IIRC), that has more than enough power (500W).
I share the same (or similar) fear, but for slightly different reasons. Let me explain. My homelab started as a case missing project. I had some leftover components and an old computer case. In order to make it work/fit, I had to butcher an old PSU. Everything worked and I started upgrading. Now it’s running my UnRaid server. If I planned to have it running 24/7 I would definitely use some better PSU. And until I actually upgrade it (to something which is, at least, not opened with manually spliced wires) I don’t completely trust it.