Basically, you look for all OPENING lines that you have a home favorite anywhere from 3.1 to 8.5. If you have 70% or more on either side you go the opposite way. If 70% or more is on the visitor, you go with the home team and lay the points, this has proved to go 60% in the past 5 years according to sportsinsights.
If you have the home team with 70% or more on them, you take the points with the visitor.