How to design the lowest drain outlet in the bathroom? Who can tell me?

The diameter of the toilet sewer pipe is 110mm; the diameter of the floor drain and other sewer pipes is generally 50mm, and the upper and lower risers are 75mm. The floor drain outlet should be 330-350mm away from the wall, or: 420-430mm. With an eye distance of 300mm or 400mm corresponding to the toilet. Toilet eye distance: The distance between the center of the toilet drain outlet and the outermost side of the toilet body. Squatting toilet: The distance between the floor drain outlet and the wall should be more than 600mm.