I'm not expecting the Heat to be up for this game, or to produce an "A" type of effort. Why bother, they're playing the Cavaliers. 
Based on this belief, I'll take Cleveland plus this many points. 
Miami hosted Cleveland just 2 1/2 weeks ago and won, 113-98. The Cavaliers have lost four in a row. The Heat are on a three-game win streak. This is the Heat's fourth game in six days. Miami is 5-11-1 ATS the past 17 times as a home favorite.
But are there other reasons to get involved with the Cavaliers besides perceived line value and the strong possibility of a Miami letdown? 
Yes, the Cavaliers have been blown out by the 76ers and Jazz in their last two games. But they have been tougher than you might think. Prior to those two defeats, the Cavaliers were highly competitive in five of their previous seven games - beating the Celtics, Raptors and Bulls while losing by six to the Spurs and by two to the hot Kings. 
The injury absences of Jarrett Allen and Larry Nance Jr. is somewhat off-set by the return of Kevin Love and sparkplug Matthew Dellavedova. Love went 20 minutes against the 76ers. Cleveland only was outscord by two points during Love's time on the court. Love should see more minutes against Miami. Dellavedova made his season debut versus Philly and stabilized Cleveland's second unit. He's a hustling, team-oriented veteran popular with his teammates. 
Note that Miami has played nine games since defeating the Cavaliers by 15 points. The Heat haven't won by more than 10 points in any of those contests.