Always make them look at you.

• You can easily make it with Quaternion.LookRotation. :

for(int i = 0; i < slides.Count; i++)
{
    GameObject obj = slides[i] as GameObject;
    Vector3 relativePos = obj.transform.position - camera.transform.position;
    Quaternion rotation = Quaternion.LookRotation(relativePos, camera.transform.up);
    obj.transform.rotation = rotation;
}

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