@azdavidr - I’ll take a stab at it, but I’d go with what @Brad or @Emil has to say. My sprinkler system is underground and Rachio hasn’t provided the underground installation instructions yet and I haven’t pulled the trigger on a Gen 2 -> Gen 3 upgrade.
Edit: One bullet is the total length of everything including the flow meter and the second bullet is the lead in which is included in the total length (first bullet). If I was in your position, I’d place the flow meter low (below the house outcropping) and replace the pipe from there to the top 90 degree elbow with 1" pipe. So that would be more than 6 inches of 1" pipe to allow the water to settle down more, if the plumber is going to replace 6" of pipe another 7" won’t make much cost difference. From what I’ve read in the other post the main issue seems to be at higher flows - which you won’t have.