I am not sure how you're doing yours but on mine, I did not reuse the stock pillar underneath (I wasn't about to hack it up).
I put one screw threw the top of the pillar pod and into the pinch weld in the pillar itself. You can definitely see the screw (even when painted black) but it doesnt strike me as being ugly. I dont know of a more stealth way to do it if not reusing the stock pillar.
Good luck.