I did not damage to the wiring but the mating between the channel and that forward flared piece is no longer perfect. I don't think anybody other than I would notice it unless it was pointed out. Fitting the the coax and the power cable into the channel was very, very, time consuming. The removal of the original channel adhesive was a real pain, it had to be done so that the matting surface was smooth. (There may be a better way to remove it, but I basically rolled it off with my thumb.) If I were to consider going the channel route again, I would remove the 24 gauge power wires from the sheath and route only the wires in the channel - the coax would then present the biggest chore. All things considered, I think it was not worth the time, and effort. Also, if there is ever a problem, with the camera, rain sensor or mirror, Tesla might, right or wrong, blame my work.
If I could do it all over, I would place 6mm double sided tape along the channel and stick the cables to it. I would use acetone to remove the labeling from the cables before sticking them up. I might then pop the main trim from the windshield assembly and router the cable in and back out near the forward edge- just according to how it looked. This method would leave the option open to doing the channel routing later if it looked bad! And Tesla techs would not have to concern themselves with my dash-cam cables.
The secondary channel was mentioned along with a photo "
Vendor - We're Now Offering Dual Dash Cam Installation"
PS: I am 70, was working alone and its over 90 degrees here; maybe that factors into my frustration. But a 10 minute job that leaves my options open sure looks better than the 2 or 3 hours on the channel. If I were younger and had a helper, or maybe if I were the helper, to a proficient, agile, technician the job would have gone more smoothly.