What do you think of the Titans at +7 and my betting system?

[Moneyline]

I'm chasing a sportsbook promo that requires me to bet 1 NFL game a week for the rest of the year. The only thing I know about NFL betting is that is that home dogs are good bets, so I'm just betting on the home dog that I think is the best bet each week. Last week I put money on Miami [img]/images/graemlins/laugh.gif[/img] . This week I put money on the only home dog there is, the Titans at +7. What do people think of my bet this week, and do you have any suggestions on how I can tweak my system to make it better.

Thanks in advance...