A jackstand supporting a car 2 feet up is way different than a lift supporting a car 5 feet up.
It's not an issue of punching through the concrete but being able to hold the posts down while a car is in the air.
absolutely true for a two post lift, but a four post may be ok, stability wise ?
When in doubt, check with the manufacturer
My Dannmar (bought out by Bendpak) four-post lift came with anchors, but since it's also usable with casters, they don't
require it to be bolted down. The bottom plates on the post are a foot square and they don't go anywhere regardless of the load or car height
(Also I have a 6" slab of 4000 psi reinforced concrete).
