How can I keep three targets in sight, and keep the camera above a specific height - while it resizes?

I have a 2D Orthographic camera for a game that is built similarly to Tennis. I've been working out the code for this, and I think I'm only part of the way so far. At the moment... it... sort-of keeps the two players in frame, with the frame leading more towards the human player - Player One. However, it also has a tendency to drop below the ground level - especially when it zooms out to keep the targets in view. There are three specific targets: The Ball, Player One, and Player Two. I'm probably way off, but this is my existing code:

 using UnityEngine;
 using System.Collections;
 
 public class CameraController : MonoBehaviour {
 
     // Moving Camera, This Camera tries to follow Player One, Two, and Ball //
 
 public static CameraController Instance;
 public Transform PlayerOne;
 public Transform PlayerTwo;
 public Transform Ball;
 
 public bool Ready = false;
 
 private float MinX = -46.0f;
 private float MaxX = 46.0f;
 
 private float MinY = 12.0f;
 private float MaxY = 35.0f;
 
 private float LimitFromPlayerX = 20.0f;
 private float LimitFromPlayery = 20.0f;
 
 private float DistanceToGround = 0.0f;
 private float DistanceFromCenter = 2.0f;
 
 private float Height = 4.0f;
 
 private float Damping = 5f;
 
 private Vector3 EstimatedCameraPosition = Vector3.zero;
 private Vector3 WantedPosition = Vector3.zero;
 
 void Awake()
 {
     Instance = this;
 
 }
 
 public void SetCameraPosition()
 {
     Vector3 PlayerPosistion = PlayerOne.position;
 
     PlayerPosistion.z = -10.10f;
 
     transform.position = PlayerPosistion;
 }
 
 // Update is called once per frame
 void FixedUpdate () {
     if (Ready) {
         Vector3 PlayerPosistion = PlayerOne.position;
 
         PlayerPosistion.z = -10.10f;
 
         Vector3 CameraPosition = transform.position;
 
         CameraPosition.z = -10.10f;
 
         // Get the Distance from the Player to the Ball //
         Vector3 WantedPosition = PlayerTwo.transform.position - -PlayerOne.transform.position;
 
         float WPMag = Mathf.Abs(WantedPosition.magnitude);
 
         WPMag = Mathf.Clamp(WPMag, 20, 40);
 
         Debug.Log(WPMag);
 
         Camera.main.orthographicSize = WPMag;
 
         transform.position = Vector3.Lerp(CameraPosition, WantedPosition, Damping * Time.deltaTime);
     }
 }
 
 void LateUpdate()
 {
     Vector3 Posit = transform.position;
     Posit.x = Mathf.Clamp (Posit.x, MinX, MaxX);
     Posit.y = Mathf.Clamp (Posit.y, MinY, MaxY);
 
     transform.position = Posit;
 }