The need to (or not) carefully track the sun for solar

Not clear on what Mex means. As you go North in summer you get more daytime out of the 24 hrs, so that would mean longer time shoulder hours away from South pointing. (near the Equator ISTR daylight/night are more equal for times)

So I would think ? that would mean more value for tracking around to the E in the morning and W in the evening farther North? Of course when you do that the sun is low, so you should tilt the panels up quite high those times.