While I was working on my fog lamps I updated to 3000k HID's. I do miss my retrofit projected fog I had in my B5 S4 as they was zero glare with them. As my current B8.5 S4 is using a reflective housing, glare is a problem. Typically what I will do is measure from the ground to the top of the fog lamp and then put a line of tape on my garage door at the same height (showing below). I try to get the hot spot of the beam to be slightly below the line to minimize glare as the beam is angled down.
So far I'm pretty happy with the setup. The fogs are slightly less noticeable when off, but when they are on, the light is perfect for our often rainy Seattle roads. I'm be looking for a different setup of HID bulbs as the color is a warm yellow, but not the golden yellow I am after. We will see...