You MIGHT have trouble with some camber plates in conjunction with these.
Raceseng's actually have a portion that rises UP in the opening. Maybe you will be lucky enough to use them if there's enough space to let the lip of this do its thing.
Other camber plates are perfectly flat and thus cause less of a problem.
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Also, even if you have a flat camber plate your camber setting could be pushing the locking bolts right up to the edge of the opening (depends on the brand and your setting) but you could notch the lip.
Just something to look out for. These aren't a bad idea but as the other guys mentioned, a lot of dirt comes from UNDER the plate. Still though, not a bad idea.