The shower drain has to be at the lowest point of the shower floor, and so the floor has to slope down toward the drain from all directions. If the drain is in the center of the floor, you'll have a relatively level space around the drain to stand on.
What is the rough in for a shower drain?
Toilet Shower/Tub
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Discharge/Drain Hole from Back Wall 12 1/2" 14"
Discharge/Drain Hole (Vertical) 0" 0"
Fixture (Side to Side Buffer) 15" to 18" min 18" min
Fixture (Front Buffer) 21" min 18" min
Does a shower need a 2 inch drain?
A 2-inch pipe is the recommended size because showers have a low threshold for flooding, and a 2-inch pipe helps the water drain faster than does a 1 1/2-inch pipe.Aug 8, 2021