It sounds like the screen broke in every one. That is, the glass backplane shattered. While one or two might be down to manufacturing fault, for all seven to break means that you're doing something to them that breaks the screen - something pressing the screen or twisting the case.
So getting a Kobo is unlikely to help you, as the same thing is likely to happen.
There are a very few eReaders that have a non-glass backplane for the E-Ink display. The Wexler Flex One was one, but is now discontinued. The EARL will be another, if it ever actually ships. Perhaps, given your track record, you should keep an eye on the availability of such devices.
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