I would recommend N-motion in North Burnaby. I do not have cameras installed by them, but I have had parking sensors done. I have spoken to them about Blackview cameras and had an estimate. If I remember correctly, it is about 300 cdn labour on top of the unit price for a dual camera setup. They have experience with Teslas and explained how they go about wiring in.
my Blackvuew 650gw-2ch was installed a couple years ago by RPM Electronics in Burnaby, they did a good job.
At the time they had a bit of a discount for BC Tesla Owners Club members, and my understanding was they had done quite a few Blackvue installations in Model S before I had mine done. They charged me 2hrs @ $80/hr + the dashcam cost.