Well. Yes front mounts are legal; if your car happened to come with one. If your car didn't, you are effecting the frontal impact area of the car, particularly if you're removing material and/or structurally modifying the front end to make it fit.
There is no room in the mod plate system for a front mount, and a lot of reputable engineers wont engineer a car with one.
Don't shoot the messenger, this is just how it is.