They go under the "flat spots" on the hood. Look at the underside of the hood and you'll see the 3 areas that would be "lower" or closer to the firewall. One of mine is actually stuck to the hood! Been there for all 6 years I've owned the car.
Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both tops
1994 E420