This is an old picture but here is how I mounted mine, I used ones from a pick and pull so I didn't destroy my good ones, I had it rapped in sub carpet because I was to lazy to sand and paint the enclosure, I've since made it better but I don't have a picture of it and my car isn't with me right now.
anyway I used some fiber glass to smooth the tweeter, it actually decent now... But I think it's a great location and if they swivel like mine then you can adjust the angle after install...
I got the idea from another car... I think it might actually be were they are placed on the mk3? I don't recall, but I think that's were I stole it from...