Electric tape does work fine, but it’s not as good as the yellow tape IME- over time it becomes much more likely to come loose when you change a tyre. Which isn’t really a big deal, but it’s irritating when you’re in a hurry.
As for non-UST tyres, as long as you use suitable standard tyres that tubeless up well, I’ve never found any reason to use a rim strip, yellow tape and valve works near-flawlessly. I’ve had one significant burp, as a result of mashing my wheel off a boulder the size of a fridge while in France, but since it took a lump of rim and a chunk of tyre with it too that seems reasonable 😉
(FWIW, non-UST tyres that have worked flawlessly so far are folding Kenda Nevegals, Smallblock 8s, Telonixes and Excavators, wire bead Maxxis swampthings and minions, folding minions and highrollers, folding Nobby Nics, and folding Conti Barons and Rubber Queens. All had quality beads that were pretty tight, ymmv with less good brands like Panaracer with beads like a wizard’s sleeve.