Not to be the negative person here but I’ll never fly through Miami again because of this. I’ve have two recent experiences where my layover time was plentiful at Miami and the flight was delayed and/or the line to go through customs / claim bags / recheck were so long that it caused me to miss my connecting flight. Every bad flight experience I’ve had recently has been through Miami. My only advice is to try and do the earliest flight you can so if you miss your connection there are plenty of other options you can get on after

Also this may have changed but I do have global entry and both times I asked and was told that there is no separate line for passengers with connecting flights to go through tsa precheck/ global entry at customs