I wouldn't try front squatting on a smith mate, one of the exercises that is best done free weight or not at all. Smith squats place more emphasis on quads as it is and reduce glute recruitment.
Squatting in general shouldn't hit your hamstrings anywhooo.
I really hate the smiths, I wish they'd smash it and get a squat rack.
but oh well , romanian deadlifts and hamstring curls do the job.