TV Episode Poster Orientation

Is there a way to have TV episode posters show as vertical rectangles (like movie posters) instead of horizontal? For example, I am putting the ESPN 30 for 30 series on Plex. All of these are movies, but they are classified as a TV series since they are part of the 30 for 30 series. Since ESPN created movie style posters for each, I would like to use those instead of having a horizontal preview of the movie. Is it possible to modify a setting in order to change the orientation to a vertical poster so I can use the posters ESPN created?