Harnesses are nothing but hassle in a normal car. The upper mounting points NEED to be as level with your shoulders as possible - if they're higher they won't prevent you from submarining in your seat (5+ point will help), if they're lower then they can crush your spine. I'm not scaremongering, I've built a kit car and your SVA is very specific on the matter, also you can find that the FIA states that the only acceptable angles are between level and 10 degrees below that here: http://www.fia.com/resources/documents/895276808__8855_1999_Competition_seat.pdf - they do have harness specific documents but they're all in french.
thats where i was going to mount them....do u think it would look silly ina 5 door would they get in the way?zak