Yep ET that's pretty much the way I'm doing it just have to get my hands on a heat gun for the final pretty up .
Have found the original screws with a washer are brilliant and if I slot out the edging I can manipulate it for a better easier fit ,have left the test piece a bit longer than required both ends .
Once in place and I'm happy ,then to fit a mudflap that's functional but won't get torn off first ding it gets .