Yeah it's pretty well solved. You can buy players at retail for many years. I'm not sure what products handle this much scale seamlessly but Brightsign is the one I always preferred. I haven't gone past 4 players but it's really easy to send it a gigantic video and the software will send crops to different players and play them in sync. We did like a 10k display for very up close viewing and there was no code to write or anything. Just spend the money and run the cables.