They could be said to be naturally intelligent, yes. However they only have to point at one target, the sun, while the mirrors have to point halfway between two targets, the sun and the tower.

You can replicate this behavior with four solar panels mounted on a motorized platform. The panels should be at a slight angle, with a peak in the middle... then a voltage differential top-to-bottom activates the vertical motor, likewise the horizontal motor.

I'm not sure how to make such a simple system for mirrors pointing at targets, but I suspect "AI" and "cameras" are overkill.