If you care to scroll down that eBay listing there are other DC supplies there with shrouded terminals.
Don’t use a tens of kHz supply on lamps designed for 50/60Hz then complain they don’t last.
If I scroll down that listing there are also dishwasher tablets. What’s your point?
The product you linked to is totally unsafe and unsuitable for what the OP requires, but you’d rather continue to bleat on and on with your ridiculous fantasies rather than admit that LED lamps are not polarity sensitive and will work perfectly well when supplied from an AC electronic transformer.