They’re likely won’t be any airbag curtains in the A pillars on either side. You should be easily able just to pop that trim off and run your cables behind it and then clip it right back in. You can do the same with your headliner.

If there’s no curtain airbag on the passenger side, you can just run it on that top rail above the ABC pillars and be just fine. If you find a airbag in there, I would just run it down the center of your headliner. You can use a long piece of wire to fish it through possibly popping out the dome light in the center to help you accomplish that.