Personally (and I'm paranoid), I don't like anything bolted to the brake pedal. Should it work loose at a bad moment, it could impair stopping the car. I assume these are robust and unlikely to come loose, but be careful on the install to be absolutely certain that the brake pedal pad cannot come loose. For example, in a panic stop, you could easily get just the corner of the pedal and press with quite a bit of force. You won't have time or the presence of mind to lift and reposition your foot and if the cantilever leverage on the pedal were to knock the cover off or akimbo, it could be bad.
Mind you, I've never heard of this happening, but once would be too many times.