We have learned through the years how to properly install netting. We have always tried to inform the industry of the most current advances in installation as they develop. 5X5 treated or our latest discovery is 6.5 inch fiberglass well pipe. It comes in colors too. Poles can be placed from 20-40 feet apart, depending on size of pole and wind speeds of the local area.
High winds do more damage to netting than any other factor.
Poles should be planted about 3-5 feet depending on the height used. This keeps high wind from damaging the nets when you're gone. I am amazed when I see netting attached to the rope with zip ties.