I've also spotted a Titanic model in the 2011 film Diary of a Wimpy Kid: Rodrick Rules, and have found two screencaps of it online, one showing it from the port side, and the other from the starboard side, which I am posting here.
I guess the filmmakers put the model in because the scene in the film shows a teacher telling his students about events that happened a century ago.
I decided to post a picture of the scene from About Alex showing the Titanic model. It's on the top of the refrigerator on the top left hand side of the photo. I took this photo from my smartphone showing the snapshot of the film from my laptop, so it might appear a bit fuzzy. The main character Alex, played by Jason Ritter, is standing in the center of the photo.
I wonder why the filmmakers decided to put a model of the Titanic as a prop in the set decoration.