For the best sound, the tweeters should be as close to ear level as possible. In the A pillars will be optimal, but I think the Focal's need a deeper mounting depth for there tweeters. Not sure if it will fit in the pillars flush. I have the K2P's, havent installed them yet, but I have great installers thinking something up.

 

Original owner installed the door tweeters. Just wasn't enuf highs from that mounting location, most of it lost on your leg. Holes were already there so I left them there.