Not an easy question. How are you trying to use this? Outdoor point-to-point/point-to-multipoint links?
Lots of variables involved with this, like tx power, EIRP, fresnel zone, obstructions/line of sight, link budget.
Honestly Meraki 'mesh' isn't super fantastic when it comes to trying to setup a point to point because of its VLAN limitations.
If you need multiple VLANs, your going to need to find another solution, UBNT/Ubiquiti has good gear for this, and cost effective.
https://documentation.meraki.com/MR/Deployment_Guides/Mesh_Deployment_Guide
Ethernet bridging
The gateway access point may be configured to connect to a trunk port and trunk SSIDs to different VLANs. Repeaters will also serve SSIDs trunked on different VLANs. However, only one SSID & associated VLAN may be configured to bridge wired clients across a mesh link on a repeater access point's Ethernet port. A mixture of wired clients and Cisco Meraki access points attached to one MR repeater interface is not a supported deployment configuration. This is due to the auto detection mechanisms that Cisco Meraki access points use to infer when they should function as a gateway or a repeater.
