I went through Orlando vs Atlanta this year in the 1H and this is what I found...
2 overs and 5 unders H2H 1H. Avg score between the two this season including the playoffs in the 1H is 87. Barring that incredible 2Q by the Magic in Game 2 I believe of the playoffs where I'd expect the Hawks at home will play much better defense in the playoffs, the avg might be lower.
Atlanta at home vs the Magic the 1H have been a combined 82.6666. 78 the first meeting, 81 the second time and 89 the third. The Hawks are ranked #27th in PACE and should slow this game down. If you aren't wanting to take a look at the 1H under, the total game under is appealing. GL whatever you do.
VS division opponents they're 4-14 UNDER this season, 19-41 past 3 seasons.