When William "The Fridge" Perry scored a late 1 yard TD during Super Bowl XX in January of 1986 for the Bears against the outmanned Patriots that prop was murder on the books.
And a big reason even a middle wouldn't be a death sentance. Most props now have such horrible payouts no matter what one you pick. Even if the wrong team covers, the books should make out nicely on people betting if there will be a safety or not or an under 30-yard field goal or whatever else they put up
St Louis-Tennessee never moved off 7, looks like this one might be similar. Up to a full two point middle last year, I think