Correct, if that is the case and you want a 2.4GHz only network, call Meraki Support, as that option is not necessarily visible by default and they can enable a back-end feature to also give you a 2.4GHz-only radio button just like the 5GHz only button, and you can do this on an SSID-by-SSID basis. On the other hand, if you MUST support legacy 802.11b rates, you could also consider using AP tags and SSID Availability to only broadcast a legacy SSID at the 11Mbps rate from specific APs only where it's needed.
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