Dash,
I'm close to all of these with a slight variation. Flat surface with the car driven or rolled enough to settle the suspension. Take a pencil-type white out marker and make a 1-2" straight line mark (along the rolling axis of the tire) as near the center of the tread of the front tires as possible, both lines the same distance off the floor. Measure the distance between the marks with a tape, then roll the tire to where the marks are on the back as high as you can measure with a tape. The difference between the two measurements is toe in or toe out and the marks will last long enough to move the car multiple times while you get it correct. You may have to jack the car up to loosen the tie rod lock nuts. If so, remember to bounce or roll the car to settle the suspension before measuring. On my TR3, I would drive the car with my toe setting versus taking to a pro. On the Boxster and Lexus RX, I checked the toe after replacing front struts and before I drove them to a pro for a 4-wheel alignment.
All these methods work, some are easier to set up and perform than others, i.e., your mileage may vary.