I'm very surprised this total opened at 6 with juice instead of 6 1/2 or even 7 given the low quality of these defenses. 
Ottawa ranks 29th defensively giving up 4.0 goals a game. Vancouver is even worse. The Canucks surrender an NHL-high 4.7 goals per game. They also allow the second-most shots on goal.
Vancouver has given up an average of five goals a game during its past six games. The good news for the Canucks is they have young, talented goal scorers. One of these is Elias Pettersson, who is starting to emerge out of an early-season scoring slump. The Canucks should get their share of goals against an Ottawa squad that just surrendered four goals in the third period during its last game, a 6-3 road loss to the Jets this past Saturday. 
The Senators have permitted at least three goals in all five of their games. Goalie Matt Murray has not looked good in the early going. 
The Over has cashed during the past four meetings between the two teams. That trend should continue as I'm expecting a loose game from two teams with a combined 3-9 record.