The idea of a tease in the NFL is to get through 3 and 7 because those numbers are so common as to be valuable and the NFL market is so efficient that both sides pay pretty frequently. Many situations are actually a profitable play long term, teasing short dogs up to past 7 and medium favorites down to under 3. Tonight's game is a pretty good example. Seattle has been bet up substantially (80% of bets) but it hasn't moved to 7 even though it probably should. They've been bet up on the ML also, but there are no barriers to just arbitrarily moving the money line, so this resistance to 7 builds a lack of efficiency into the spread/ML relationship. So, if you wanted to parlay the Seattle ML with some other game priced exactly the same (-6.5/-300), you'd actually be paying a premium to make that bet vs what the spread says it "should" be. Those two -300s parlayed together cost -129, but teasing those same two gives you -1/2, -1/2 and you only pay -110...much better deal, as the possibility of a tie isn't NOTHING but it's not worth 20 cents.
In your case yesterday, you had picked two games that generally fit that model and so I figured off the top of my head a tease would be better, you'd essentially be using the above pricing advantage to get Chiefs points at the same payout...specifically (if the Chiefs had been -3 at the time), instead of ML parlay 20/34, you could have gotten a teaser at roughly those same odds but having the Chiefs +3 instead of PK and having to lay 1/2 or 1 in the other two games. If you win, it doesn't matter, of course, but long term you're trying to turn those close Chiefs losses into a winning ticket and risking the occasional downgraded payout for Browns winning by one and pushing or actually losing to a tie Browns or Giants tie.
Teasing through 0 isn't long term profitable, you're just going through a bunch of low likelihood numbers...but you'd already landed on the teams. If you're ML parlaying those examples like tonight in the 6-7 range, it's always worth pricing it both ways to either confirm you're getting the best deal or see if there are free points laying there.
Hopefully that all makes sense. Google "Stanford Wong teaser" for more than you've ever wanted to know about this.