Ben setting up a video wall with MagicInfo pro is easy. I have exactly one like you said, 1 x 3 in a portrait mode. I can send you some images if you want. You need to organize the Group Setting and then allocate (drag) the displays in the Group you have created. You must name them as appropriate so tyhat you know their position and where they fit within the video wall, e.g, top, middle and bottom.
You need to create a template, by first creating a Workspace for Video Wall and then either do a Photo or a Movie. From what you said you wanted to use simple portrait pictures, and will look great on a 1 x 3. I cannot send you my content as it is company specific, but I can send you something different if you want. Where is your country?
With MagicInfo pro (or MagicInfo I) you can do video walls easy. If you want to I can send you my settings and see what you think.
Bill