Placing objects around a sphere in Unity3D

sphereGameobject.cs

// sphere radius
float r= 5f;
Vector3 randomPosition  = Random.onUnitSphere*r;
		
GameObject o =  Instantiate(item, randomPosition, Quaternion.identity ) as GameObject;
		
Vector3 up = randomPosition;
Vector3 LookAt = Vector3.Cross(up, -transform.right) + up;
o.transform.LookAt(LookAt, up);