Last time I set alignment and toe I used two sheets of stiff clear plastic under each front wheel, no grease, no alignment plates, worked like a charm. No issues turning the wheels to set camber/caster. About the same thickness you'd tape to the inside of a Harbor Freight bead blaster window (if that helps...) I have alignment plates but it's a pain to get the car on them, and sometimes you need to roll the car backwards then forwards after making a suspension change in order to get the chassis to settle. Unless your floor has recesses for the alignment plates you need some makeshift ramp to get the car back on them. But not with the plastic sheets...works only on a smooth surface though...I imagine two sheets of sheet metal with a little grease between them would work as well...