I believe that just make sure everything is plumb and is under pressure. My inspector was here only 10-15 mins tops. But they should definitely use 3 pads and the main valves can be plumbed right in front of the pad and not on the side so you can't get through. See my pics below, I have a small side yard like you but I can get through easy once the trench is filled in and there is only 1 pipe on the side opposed to all of them.
.
Sent from my iPhone using Tapatalk

.

Sent from my iPhone using Tapatalk