I agree that smith should be avoided. I can do heavier and deeper squats in the smith , with better form too, yet it feels like shit. Move feels ( is ) unnatural and you have no idea what parts of your body you are loading, smith sucks!
Single leg work with dumbbells can help you create a serious overload serving you much better than the smith. BSS is an option, low box pistol squats with DBs is another, or DB full pistols if you have the strength and balance to do them.
If you HAVE to use it , the answer to your question is what D4 said.