How do timeslots work in the NFL?

I get that the west coast teams play later than the east coast teams, but where is the line drawn. I understand a team from Cali getting the last time slot but could that also go to a team like Arizona or Denver that are a little further east? I live in New Zealand and it’s much easier to watch the later time slots so which team(s) can I rely on to watch late every week when they play at home? And on a seperate note why is it different in the playoffs? I see the upcoming Chiefs home game is a few hours before the Lions home game even though Detroit is far more east than the chiefs are.