If Boston beats Miami they will be either the 4th or 5th seed. Boston will be 4th facing Miami 5th if Atlanta wins. If Atlanta loses then Miami wins the tie breaker by winning the division and this gives Atlanta the 4th seed and Boston the 5th.
If Boston loses to Miami then Miami gets the 3rd seed. The Atlanta outcome does not matter then and Atlanta is the 4th seed. Boston is then 5th facing Atlanta if Charlotte loses, or 6th facing Miami if Charlotte wins.
The only way Boston gets home court is if Atlanta wins and Boston wins.
"If Boston beats Miami they will be either the 4th or 5th seed. Boston will be 4th facing Miami 5th if Atlanta wins." BUT not if Charlotte loses, in that case Boston will be 4th and Charlotte will be 5th
(sorry I dont know how to quote just a portion of someones post)
If Charlotte loses they are the 6th seed period. They will only have 47 wins and can only tie Boston if Boston loses. In this scenario Boston wins the tie breaker and will be the 5th seed against the hawks 4th seed.
I did leave 1 scenario out of my post though. If Atlanta, Boston and Charlotte all win. This results in a 3 way tie between Bos., Mia. and Cha.
Atlanta 49-33
Boston 48-34
Charlotte 48-34
Miami 48-34
Miami gets the 6 seed based on head to head games between the 3 teams. Boston 5-1, Charlotte 3-4 and Miami 2-5. The reddit post above is incorrect and hard to read. Crazy ending to the season with only 2 of 8 playoff series decided going into the last day.