Teaser questions

Teaser questions I am looking at a couple European books that offers single game teasers if Seattle are -8.5 -110, what should be the line at -1.5? I can get -300 If Philly are ML -130, what should be the line at +4.5? I can get something close to -260, which I think might be super value, but I am not to confident, calculating through that many numbers.
You need ~-240 to break even on a one team teaser and I wouldn't advise teasing Seattle this week at all. The one strong candidate is Carolina.