I should clarify, I use 2amp adapters that aren’t the worlds cheapest. So they tend to be underrated. Also, the 1amp/meter suggestion is based off all four channels being driven at once. Even with my 2 amp adapters, they will get pretty warm if I do that. Fortunately I don’t. I’m usually just using the white channel or a mix of 2 of the color channels at partial power levels. I’ve been too lazy to throw my multi-meter between the adapter and strip colors to see actual draw, maybe I’ll try that today. I have a 1.5amp flat adapter on one strip right now, ran it for 12 hours yesterday with all four channels on full and it was warm but not as hot as the 2amp wall warts I use for others. It’s all about build quality with AC-DC adapters.
I do have a 30amp “real” power supply running my led’s on my back deck, that’s so much overkill it’s crazy, but it never even really gets warm either.
Something else you could easily do, grab some old PC power supplies and use the 12v rail on those. I’ve got a spare Corsair CX430 that’s rated at 32amp’s out of it’s 12v, and I can assure you those are FAR better power supplies than any wall wart style sold with LED’s on Amazon or AliExpress.