I can use Fire HD Plus 10 2021 (claimed to be from US) with Night Shift app in Bright mode for as long as I want to, its screen is very calm. I could probably use the tablet even without Night Shift, but this way the colors are softer.
It appears to be picky about SD cards. It constantly rejected a no name card, but the Samsung Evo 128 GB works fine.
Before that, I had to return Lenovo Yoga Tab 11, which caused me eyestrain and even slight nausea: it does something wrong with the vestibular system. Besides, it's too bright, too blue, and its colors are unnatural — probably all that's interconnected.