The thing about toe plates it its sitting on the tire. The tire can have imperfections in the side wall throwing off toe not to mention the bulge at the bottom of the tire if air pressures are not the same. They do work and are great for quick settings for when at the track or to get the car to alignment person after a part replacement. But me personally wouldn't depend on settings for everyday use. Measuring off the front of the rim at 9 o'clock position and the rear at 3 o'clock position is very accurate unless you have a bent rim. I also use a digital angle finder with a magnetic base to set camber and caster. I use a piece of straight edge that sits against the OD of the rim and set the finder against it. For caster I just place it on the strut and adjust.