I'd recommend doing some checks as a volunteer until you have much more experience. Get a senior checker to hang out with. I'm sure you've installed lots of seats, but that isn't all what being a tech is about. As you may be aware, CPS is moving away from techs as installers to techs as educators. That kind of interaction with parents comes only from experience in educating parents.
There are dealerships with techs on staff (some good, some not so good), but they usually have other roles in the dealership. My experience with dealerships is it is hard to convince them that what you are doing will actually help their business. Yeah, they're all for child safety, but laying out money to do it is another issue altogether.
That being said, I am currently coordinating a pilot program with a local dealership. Even though we are there at least once a week, many there have really no idea what we're doing or why. Everyone is very nice, but a lot of the staff and management just don't "get it." The dealerships in this pilot were chosen by the car manufacturer. We had a lot of support from the lead corporation, but still the information is slow to trickle down to the actual staff. They are all wonderful and helpful, but remember the dealership is about selling cars. Of course, being known as a dealership that cares about CPS will probably get them business, but to most of them the link is pretty tenuous.
Start small. Do some checks with senior checkers and instructors. Get real tech experience before trying to set up a check. In the new CPS curriculum, there is no longer a section for students on how to set up a seat check. The board really felt that was really more than brand new techs (even students who have installed carseats before) should ever attempt to take on.
I'm not trying to be discouraging. I'd just suggest taking much smaller steps at first.