I run a line of silicon all along the edges and around the screw holes
Agreed, I put some sticky rubber tape on the underside of my plate to keep it from rattling.just attach some felt pads to the back of the plate, works for me.
My dealer provides something similar, problem solved!I have happily used a rigid frame similar to the following - little or no flex nor need for tape etc...
Exactly, there are usually different length screws provided or available. Use short ones to secure the license plate at the bottom of the frame to just the frame and longer ones at the top to secure to the trunk lid. There is also a lip on the bottom and sides of the frame that you slide the plate into giving a bit more on the fit and finish side...Can you guys post pictures of those frames installed? So do you guys mount the plate onto that frame using all 4 screws and then mount the frame on the trunk with 2 top screws?