create Render Textures at runtime

Hello there,

I'm wondering if anyone can help me. I am bit lost and haven't been able to find any information that could help me here or anywhere on the internet.

I want to create several CCTVs at runtime. This is because I may need to create 10 or 50 or 25 CCTVs or "screens" depending on the outcome of the gameplay.

So, I read it was possible to create Render Textures at runtime. I am using c#.

Here's what I have tried:

 public GameObject CCTVScreenPrefab; //Prefab Added via the Inspector
 public GameObject CaptCamPrefab; //Camera Prefab Added via the inspector
 
 void Start () 
 {
     GameObject CCTVScreen = Instantiate(CCTVScreenPrefab) as GameObject;            
     GameObject CaptCam = Instantiate(CaptCamPrefab) as GameObject;
 
     //Creating a render texture at runtime:    
     RenderTexture RefTexture = new RenderTexture(256, 256, 24, RenderTextureFormat.ARGB32);
     RefTexture.Create(); // Not sure if I really need this.
 
        //Linking everything:
        CaptCam.GetComponent<Camera>().targetTexture = RefTexture ;
        CCTVScreen.GetComponent<Material>().SetTexture("_MainTex", RefTexture);
 
         //I tried this too: CCTVScreen.GetComponent<Material>().mainTexture = RefTexture;

But it won't work. What am I doing wrong? I really don't want to create 50 render textures on the scene if I don't need them. Just the number of cameras and the number of render textures and the number of "screens" or objects to display such texture at runtime.

I tried the standard shader as a material for all these objects or "screens". Ideally, the mobile/diffuse shader would be better as the simulation is for mobile phones and tablets.

I am also using at the moment Unity 5.2 Personal. For what I have researched, Render Texture is available for Unity versions greater than 5.0.

Thank you very much for your help.