I'd expect 1-2 broken or lost Kindles during each tournament day. Do you plan to use them each weekend?
I like the idea to aid the players and to allow them to submit their data on their own. Based on what I know right now about your plan I'd avoid implementing it requiring Kindles.
In any case you need a central application to handle the data. You need to setup a private wifi - this could be an issue if you have a lot of clients/data. And you likely need to provide USB charging slots.
It will be 'net' based as you plan to use wifi. It may be more easy to build a web application so the users may use their own smartphone browser to get the data.
I know the display is smaller but you could run the web app also in a Kindle or Kobo browser if available - so it would be completely device independent. And for finals you may use a 4K screen and show the browser/web UI there.
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