When you entered the upload and download values in the WAN setup, you told the router how “big” the pipe is. Once your traffic reaches these limits (maybe a little before), that is when the bandwidth limit/reservations kick in.
Imagine an intersection without a traffic light. A traffic cop needs to direct traffic during the busy hours of 9-5. Since there is no traffic after 5 – there really isn’t a need for the traffic cop to be there – this is kind of the same principle.
As long as current throughput is less than total capacity - there is no need for “shaping” the traffic. As soon as current throughput is greater than total capacity - that is when these rules kick in.
My advice is to run concurrent speed tests across several devices and then see what results you get. Make sure to include at least one device from each group (manager and staff)