I would only use a teaser when fishing off a beach , an inlet or estuary/back bay or other areas of soft structure. It would be a shame to loose the fish of a lifetime when your plug is securely hooked up and your doing everthing right except using a teaser around hard structure which hangs up and costs you that fish.
I don't believe in using a dropper, I don't want additional knots or items on my main leader. I use an improved clinch off of my
swivel 7-10" for my teaser and 30-40" to the plug.