Never had an mamazon tablet but I guess it has a modified android version like their tv dongle so mostly any "real" android tablet will do, cheapest one would be less reactive but still will works. I had mine on an old Huawei tablet but today I would go for something like Xiaomi pad 6 (don't think it is worth to get a high end tablet for that purpose), whatever you get disable battery saving functionality for kiosk app and you should be good. As for telemetry/spyware, block it at router level so it will be limited to your local network.