The best way is make your own. Then it fits and matches your boat and you can tighten it as it ages. And you can set the size of the spaces to fit the appearance you want. Usually wove between the middle life line and deck. Start with plenty of line so the finished net is one continuous line. You have to add attachment points on the deck like an eye loop or strap. If you're going to screw into wood or a cored deck, drip some epoxy down the screw holes so they hold well and won't allow water to get into the core.
How we made netting in the navy and I still do...
White looks better than black, and the one shown was several years old.