First off, I don't do much irrigation so this question is probably pretty amateur. I have a customer that had a big name irrigation installer install exactly what she DIDN'T want. He put in drip line in a bed where I was going to install some sod into, which is why she asked for mist zones. Anyway to make a long story short, he now won't come back out and change the system over. I would like to know how many mist heads you can run on one zone. The guy that installed the drip has approx. 500ft of drip hose on a zone. It is going to be a big deal to add another zone because it's location and we would need to install a new controller, this one is maxed out with zones. I have attached a crappy image of the area. I put in a few measurements. If you could help me place the heads that would be great, and what type of heads. I believe the PSI is 60-65, according to what the plans showed for the previous installer. What isn't sod is plantings. Remember, one zone if possible.