My experience
Our 1st FL house in Sarasota had St. Augustine grass(which grows thick & high) and after 3-4 years it had matured and grown to the point the one doughnut was not enough.
I had to put a double doughnut layer and in a number of cases replace the sprinkler head with a taller one.
Here in T.V. with Zoysia grass , this has not happened, grass does not grow as high.
Just insure that the heads clear the doughnuts and grass.
Hope this helps.
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“Never take a person's dignity: it is worth everything to them, and nothing to you.” -Frank Barron
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