2 questions about 2D camera posistioning.

Overview of my game is you have to drag to dodge enemys constantly running at you and each time you do you get a point.

First thing I want to do is set it up so I can have the enemy respawn with a random x between the edges of the screen that works on any device. using UnityEngine; using System.Collections;

 public class ResetBadPos : MonoBehaviour {
     System.Random r;
     int rInt;
     int tInt;
     System.Random t;
     public int points = 0;
 void Start () {
         r = new System.Random ();
         t = new System.Random ();
         rInt = Screen.width;
     }
     
     // Update is called once per frame
     void Update () {
         //rInt = r.Next (-15, 15);
     
         tInt = t.Next (30, 90);
         Vector3 viewPos = Camera.main.WorldToViewportPoint(transform.position);
     
         if (transform.position.y > Screen.height){
             transform.position = new Vector3 (rInt, tInt, 0);
         }
 
         
     }

The second thing I want to do involves the line of code below and what I want it to do is reset the position when it's below the screen view but my problem is I start it out of view specifically above.

 if (transform.position.y > Screen.height){
                 transform.position = new Vector3 (rInt, tInt, 0);
             }