can I use 'ref' here to get current position of selected Game Object

Hi. In my game I have the case that at one point the Camera starts following a certain GameObject. Depending on the value of a certain variable there is a list of 14 different GameObjects the Camera chooses to follow. I wrote a working Method Follow(Vector3 Pos, Quaternion Rot) which makes the camera following smoothly the game Object. So far so good. I could easily execute the switch-case statement below in the Update() method, but my in opinion that is unnecessary and a waste of ressources since once the camera starts following one GameObject it remains with this GameObject. So I want to use something like this ref camPos=firstGO.transform.position; so camPos updates automatically when the transform.position of the GameObject changes. How can I realize this?

 switch (variable)
     {
          case 1:   
               camPos=firstGO.transform.position;
               camRot = firstGO.transform.rotation;
               break;
         case 2:
               camPos= secondGO.transform.position;
               camRot = secondGO.transform.rotation;        
              break;
     // 12 more cases to come ....
     }
     
     void Update()
     {  
               if (startFollow) //Set true by an event
               {
                Follow(camPos,camRot); //Method I have written which works fine
                }
     }