All of our high school dual meets had 2 refs. We have 2 refs for all the JV matches. We then go to 1 mat for varsity and utilize both refs. We are a 3A school. I imagine most smaller schools only have 1 varsity ref.
We wrestle half 1A and half 2A schools. We have triangulars or quads and will have one per mat. If a quad, we will sometimes run 3 officials to give them a break if every team has 10 or more wrestlers. Throw in some JV matches and we won't get home til close to midnight.
The one thing I will say is we need more officials. We have had school administrators officiate conference meets up here due to lack of officials (they are certified officials so being an actual official is not the concern). Have wrestled one team and the official was a nephew/cousin to the other HC and also worked for the guy. The HC had kids wrestling and I saw the official high five his relative after winning. Maybe it's just me but I don't think you should officiate Varsity meets when relatives and employers are closely involved. I think it would have been best to flip mats with the other official in those situations.