Had mine in the A-Pillar moldings in my 98 Mondeo and liked it. I tried the location with velcro first; makes relocating the tweeters very easy. That way I tried different locations and liked the A-Pillars best. And they are pretty easy to install there, too. The crossovers were in the right and left corners of the dash.
I have the same setup in my new 2002 Mondeo since last night, and I like it so far - but haven't really been able to do any adjustments yet.