Zach Collins Rebounds Prop is currently Over/Under 4.5 (+105/-135).
The money has been on the Over as it opened 4.5 @ +110 before it was bet up to 4.5 @ +105.
FACTORS THAT FAVOR THE OVER:
The quickest tempo visiting team in the league over the last 10 games has been the Bulls.
The Cavaliers have played at the 6th-most up-tempo tempo in the NBA over the last 5 games, which ought to raise plays for the Chicago Bulls.
FACTORS THAT FAVOR THE UNDER:
The Bulls rank as the 5th-worst offensive rebounding offense in the NBA without the home court advantage this year (offensive rebounds maintain possession, and a lack of them may therefore eliminate extra chances for scoring and assists).