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).
Well its homelab, setup homeasistant or openhab and add some air sensors and temp sensors near “problematic” devices and parts and make it send mesages to phone if anything goes out of normal values. Even shut everything down automaticaly. The beauty of home automation 😀