Rotating Minimap - Boundary Icons don't rotate

I've followed some tutorials to get icons to clamp at the boundaries of my square minimap. Each icon is a child object of gameobjects that will show up on the radar. This child has the following in its minimapIcon script;

 void LateUpdate() {
 
     <something here using main.camera y rotation?>
 
     transform.position = new Vector3(
         Mathf.Clamp(transform.position.x, MinimapCam.position.x - MinimapSize, MinimapSize + MinimapCam.position.x),
         transform.position.y,
         Mathf.Clamp(transform.position.z, MinimapCam.position.z - MinimapSize, MinimapSize + MinimapCam.position.z)
         );
     }

The MinimapCam script, attached to a game second camera (minimap) positions and rotates the minimap based on where the main camera is facing;

 void LateUpdate() {
     Vector3 newPosition = player.position;
     newPosition.y = transform.position.y;
     transform.position = newPosition;
     transform.rotation = Quaternion.Euler(90f, Camera.main.transform.eulerAngles.y, 0f);
 }

But I've noticed the minimap icons clamp in a set square boundary and do not follow the rotation of the map.

Any idea how I can rectify this? I feel I have to add the main.Cameras y rotation into minimapIcon but I'm not sure how.