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Good sprayers make sure you have high GPH flow for them to spray properly I had to use no more then 4 on a 400gph pump and no more then 9 on a foot of PVC on a 800gph pump. Or they would trickle. Also these clog easy so make sure no even a fuzzy from your pockets fall into the feed tank for the sprayers.
These work pretty pretty well if precision doesn't need to be super high. The spray pattern is a bit erratic and they can become clogged easily. They're so cheap and easy to replace that if one isn't spraying well, just toss it and try another. Definitely use exactly the correct size drill bit if using PVC.