I bought and installed the anchor RAYJAY pointed out from Autobody Toolmart, yes the floor needs to be cored, yes you need a way to install it once it's cored, I used 2 steel plates and a 3 ton jack which incidentally is almost exactly the method used by the tool you can rent to install it, here are the pictures of the process:
Coring drill with anchor pot (black cylinder):
Installed with cover in place (chipped the paint a bit but cleaned it up after):
Opened with my link extender attached (the pot is rated to 6000 lbs):
I have equal strength or greater chain, come along, and straps:
Out the driveway:
Yes it costs money to do, but quite frankly the cost of medical bills from injuring yourself being stupid or the cost of having a flat bed move a car in and out your garage every time you need it means this thing pays for itself in about 2 moves, nuff said.