I agree with most of your suggestions but would have to disagree with your positioning. While yes, this positioning does show the priority of the places, it shows them in the reverse order that the host would need to read them. The reading pattern you are suggesting would be from the bottom right corner of the paper up to the top center of the paper. Unless the host is used to reading Asian writing this is a highly disruptive reading pattern.
You could argue that the visual cues you added would negate this, but I would argue back that they would be just as effective if all 3 announcements were centered on the card with 2nd runner up at the top, 1st runner up in the middle, and winner at the bottom.