I work at a school and they have digital picture frames set up on 3 floors that just run a slide show of images stored on the attached USB drives, but they are horrible quality and one just broke. I'm trying to find a solution that will allow me to replace these digital picture frames with monitors that can be placed on each floor and all be running the same slide show mirrored from one computer, wirelessly. At first I thought maybe just get Apple TV boxes and use airplay to mirror the iMac, but I there has to be a better way, designed specifically for that purpose. Plus, I'm not so sure you can mirror one mac on multiple Apple TVs. What is the best solution?