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I tried that, to hard to find a flat surface on the wheels to get the magnetic level to stay in place.
Probably want to hit tire to tire vertically, or the edges of the outside of the rim/spokes. Then space it out as needed. Maybe prop something up to hold it up.
I set it on a cement block and pointed the laser from just behind the rear bumper towards the front, I measured at the rims on the back and front of the rear tire to make sure it was square then measured the front wheel, I found the measurements to be fairly accurate, but the battery went funny and the laser was toast, so this last time I checked with the tape measure.