Video topper is the way to go. Although the height is the same with a Super Candle installed.
"Most" A2 games will drive the video from the Bottom VGA port on the Engine. If the game doesn't support the video output, Casinos used a CoolSign or other Server based video player. The trick to that is finding the video files. New A2 games utilize whats called a Patriot Board to drive video toppers. But again, with Patriot Boards, you'll need the SD card with the video files on it. For most home users, a cheap MP3 player from Ebay works just fine repeating still images or looping a video.