I keep thinking that I’ll install flow meter with my Rachio system so that I can catch leaks. Irrigation systems kind of like classic cars - they require constant maintenance, and shit often breaks. And since I water at night, I often miss major leaks until it’s too late.
As for valve covers, your best bet is just to Google stuff and do some image or shopping searches. Most are pretty ugly, but some fake rocks and fake logs exist.
I ended up burying mine. It’s a pain in the ass, but it’s the price I’m willing to pay to not hear my wife complain about a fiberglass box.