We are a K-8 school, and our middle school students use Chromebooks on a dedicated WLAN. Rate limiting per client is very useful, so that no single student can tie up too much bandwidth, but I'd also like to ensure that as a group they don't use 100% of our allocated bandwidth. To be specific: we have a 50 Mbps Internet connection, and I want to limit the overall middle school (as a group, not merely as individuals) to something less than 50 - perhaps 30 Mbps.