Charlotte as covered just 39% of their home games this year.
Hornets have also gone 8-14 ATS (36.4%) as a home favorite this year.
The Celtics have covered 61.1% of their road games this season.
Boston has covered 61.4% of their games as an underdog.
BOS is 19-9 ATS this year as a road underdog.
Boston is 14-2-1 ATS in their last 17 games with no rest. The 2 games they failed to cover were by a combined 4.5 points. In the last 5 games they've had in this situation, they've covered the spread by an average of 12.2 ppg.
I think this game should be rated at about Charlotte -2, so I'm taking the Celtics and the 3 points (at -115).