As mentioned concrete foundation is critical. Typical garage slab, like home, are 3-4", not adequate for a 2 post lift. In my case, cut out 2' x 2' squares, excavated to 18", and undercut existing slab a couple inches. Added rebar cage and poured 4000 psi concrete mix. Used Wej-It epoxy anchors instead of the supplied wedge anchors. After some research I ended up with Atlas BP8000. Very happy with it.