Welcome to the forum from a fellow Texan here (Huntsville)! I have experimented with wifi watering systems a good bit and here are my thoughts;
They work ok but as of yet they are not 100% reliable. The weak link always seems to be either wifi connections or system software resets due to power failures etc. The big problem is that when they go haywire, your plants will die in the Texas heat very quickly, especially so for plants in buckets.
You sound like you want a set and forget solution to gardening, and I'm afraid that just is not possible. Plants need daily care for pests, watering, pruning etc. That's part of the enjoyment in gardening in my opinion. If you are wanting to automate the watering chore, I would suggest to start simple and see how that works out before investing time and money in a system that is problematic. I use the Orbit B-Hyve wifi system to water my gardens via drip tape in the rows. It works pretty good and is expandable which my be something helpful for you. The system needs resetting more often than I like though which can be a nuisance.
The shade cloth is not a bad idea for the brutal heat in the Summer, so I would implement that for sure. Lastly, take the time to enjoy the daily tasks in your new garden and slow down life a bit and learn what plants need to thrive. To me that is the best part of gardening personally.
Best of luck in your new endeavors!