Anchor depth

Also if you drill thru the concrete,
Any moisture coming up from the ground will get to the bottom of the anchor. Rust and corrosion follow a lot sooner than if it goes into a blind hole.

anchored lifts work but the concrete needs to be thicker. When I poured my floor for my lift, the manufacture suggested 6” 5000psi reinforced with either wire or fiberglass hairs at a minimum. Think about the foot size of the lift vs the leverage of the height of the lift with an unbalanced load- engine front heavy car. 4” will not cut it. just my 2 cents.