I've seen the pics of the '01 S4 with jammers in the fog light grilles, now let's see what options exist on my '02 A4. The grilles are a bit different in this car, which makes hiding jammer heads a bit more difficult, especially with the larger Blinder heads.
Here's a pic of the front of my car (bonus: I just put Veil on the headlights today).
The grilles have slats which would have to be cut to hide a Blinder or ZR3 head (though a Lidatek or AL7 head may fit). There's an opening below the fog light grilles that a LED head may fit in without alterations, but would those be too low? The upper grille (between the headlights) might be a better location but would be less stealthy, especially if I have to cut the grille.