It's not in Apple's documentation yet, but at the WWDC "managing devices" session they did have a slide indicating that a profile would be available to restrict or block the activation lock feature. It's up in the air as to when Meraki would support the new profile payload, however. I would keep an eye on ProfileCreator, so when the app is updated with new Catalina payloads you'll at least be able to create a custom profile you can then upload to Meraki.
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