Prime Movie supports 3 streams at the same time and around 4K playback with HDR on pick titles. And, as opposed to Netflix and Max, it isn't going to cost extra for 4K. A subscription nets you as many as 4 simultaneous streams (depending on the tier you end up https://www.inkl.com/news/the-best-streaming-services-a-guide-to-your-next-binge-watch