Looks like it will work for me!
Why are you wanting to use four linear actuators? Why not two simple and cheap servos with a pan/tilt bracket set (which you can homebrew if you want)?
None of the commercial (ie - large scale) 2-axis solar panel tracker designs use four linear actuators; believe me, they would if it were something that was more efficient for solar.
Also - for most latitudes, 2-axis trackers can be overkill, as the position of the sun doesn't vary enough to change the efficiency of the panel all that much. Instead, you see a single axis being used for the tracker, with the other angle fixed based on the latitude and the average position of the sun in the sky at that latitude over the course of a year...