I used the Plasmaglow strips that I purchased from AutoAnything. I put them between the headlight and the grille and ran them up over the top of the headlight. You have to peel back the rubber stripping that is on top of the headlights from the factory, but the rubber will just lay back down on top of the plasmaglows. The wiring goes under the rubber and tie wraps to the frame of the fenders then routes to the fuse box at the firewall on the passenger side. Tapped them into the wiper fuse and they go on and off with the ignition. Looks great day or night, with the headlights off or on. Not quite as bright as the Audi, Benz, 300c factory LEDs, but it is pretty close.
I too installed the Plasmaglow strips (about 19 inches long) from AutoAnything on the outside of the headlight assembly, but along the bottom. They worked great for about six months, until a few diodes began to quit working occasionaly. Then a couple quit for good. The failing diodes were in about the middle of the string, and mostly on one side of the car. I contacted Plasmaglow and AutoAnything about the failure and they told me they would replace the strips, provided they were installed correctly. I asked them what "correctly" meant when all they are is a strip of very low amp adhesive backed flexible LED light strips. How "wrong" could they be installed? That is when I found out if the "adhesive back" of the strip is not perfectly and fully adhered to the surface to which it is attached, and any moisture can possibly get behind the adhesive strip, the warranty is void and the diodes in that location might fail. Nothing was mentioned about that in the brief and simple installation instructions that came with the lights.
Since my installation was curved to follow the contour of the light assembly as it sort of sweeps down the side, and the strips are made perfectly straight and flat, by simple geometry the backing was unavoidably forced to have a slight and minor ripple to make the bend with the headlight assembly. Warranty voided. Further, to collect on the warranty would have required removing the adhesive backed light strip, which must be thoroughly stuck to the application to perform per warranty. The removal alone would destroy any evidence of whether the installation was "correct" or not.
All that said, since the failure was at midpoint of the string where it bent to follow the assembly around the side, and the strips are designed to be cut to length, I just cut them shorter (just before the failing diodes). The remainder have continued to work flawless since. They are just shorter.