I've actually a set of lower profile endlinks I ran with coilovers with camber plates + slotted lower mounts. Even with the camber adjustment at maximum at the lower mounts (-1.5* est.) at about 25mm of drop and just -2.8* front camber the endlink still made contact. The way I got around this was to raise the front ride height a few mm's and reduce the front camber a bit. It's more of a compromise than a solution.
The best way I've found to avoid contact and still maintain camber setting without having to raise ride height is to maximize the amount of camber from the lower mounts via slotting or camber bolts then do your fine adjustments using the camber plates. The more adjustment you use from camber plates the closer the endlink ends up relative to the frame. If there is a better solution I'm all ears.
Another way, I suppose, is to cut the mounting tab off the strut and weld in a potion where it sits further from the body.. I dont think anybody would want to do that.