Personally, I would configure per-user and SSID bandwidth limits on the Guest SSID on the MRs, and not on the MX. It won't be perfect, but MUCH easier to manage. https://documentation.meraki.com/Wireless/Operate_and_Maintain/How_Tos/Firewall_and_Traffic_Shaping/Configuring_Bandwidth_Limitations_and_Enabling_Speed_Burst_on_Wireless_Networks For example, let's say you have a 100Mb/s connection. Limit the guest Wi-Fi to a total of 50 MB/s of bandwidth, and apply a per-user limit of 10 MB/s.
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