There is a way to do it, but it is much easier to get a proper position (vertically) with 2 panels, and all around with 4 panels (vertical and horizontal). I would imagine those are big panels, so you might what to use a smaller set of panels to track the sun and set the bigger ones accordingly.
Also the more movement your able to give them, the better it will be. So maybe a pan and tilt feature.
Now in order to do this, you would simply compare the voltages. Now depending on which panel has the bigger value, will tell which way to move the panels to where they closely match. Like I said, have a smaller set with 2 or 4 panels and use that to adjust the bigger ones.