FWIW, I had a Fire tablet but it was so underpowered and getting apps was a PITA. Replaced it with a OnePlus Pad which has a buttery smooth UI and comes with a case and keyboard; it uses the Google Play store for apps, so no workarounds required. Wouldn't recommend a Fire tablet ever.
OnePlus Pad is equipped with MediaTek Dimensity 9000 and 144 Hz 7:5 ratio Display, and 9510mAh Battery for 1-month standby life, support a 67W fast charge.
www.oneplus.com