I don't have Camry service manual but the A pillar and rear pillar airbags are probably single, continuous air curtain. That is the case in most vehicles (and if ebay parts listing are to be believed this is true also for 2017 Camry). There is much higher chance of interference with that air curtain by running the wire above doors unless you are willing to take time and care to make sure you are running the cable above the curtain and that usually requires removal of the middle pillar trim. And that, depending on the vehicle, can get complicated (in case of my Leaf properly removing the upper center pillar trim requires removing both front and rear door kickplates, lower center pillar trim and partially removing the seatbelt) .
I usually use a thick (13AWG/2,5mm2 or thicker) solid core copper wire (with insulation on) and I loop the ends so there is absolutely no sharp edges exposed. It can be had in long sections for cheap, holds its shape so can be bent to navigate better behind panels.
The point is not the damage to the wire but the wire embedding in the heads and faces of passengers when the air curtain deploys or preventing it from deploying correctly. It does not matter if it's unlikely, you don't **** with safety systems.
This is the right and the only way to properly install cables.
I think I prefer to be safe. But the question becomes how best to handle threading through the C pillar. I saw Chris Fixx video that was posted here. In my Camry it seems to be pretty tight with a lot of obstacles in the way. I am not sure fishing the cable through would work. Has anyone tried to remove the C pillar?
I would recommend tracking down a service manual. Usually people share those on user forums for a manufacturer or specific model or they can be purchased for like $20 on ebay.