Amazoy Myers Zoysia prefers full sun, but it tolerates light shade. As long as the grass receives 2-3 hours of direct sunlight (not filtered through trees and or buildings) it should do well. It is not recommended to plant under or near trees, or in areas where you have something blocking the sun.
The easiest way to find the best spot for your plot is to do a simple sun survey. The method uses paper, pencil, and three observations over the course of one day. The ideal time to take a survey is in early- to mid-Spring, when trees are starting to leaf out and when you’re able to see the path of the sun as it crosses your preferred planting area. Draw the outline of your planting space on a piece of paper and include shade trees and or other shade producing features.
You should then observe the area around 8am, 12 noon, and 4pm. After each observation draw a circle on the paper to show the area of sunlight. Where the three circles intersect is the place in the yard that receives the most direct sunlight. With the survey you can prioritize your planting space.