Yes, Meraki allows local overrides for Layer 3 settings on networks bound to a common template.  Layer 3 Routing & DHCP settings (including VLANs, static routes, and OSPF) can be customized per network, even if the network is bound to a template.    No, you do not need separate templates for each network.    Templates for Switching Best Practices - Cisco Meraki Documentation  Managing Multiple Networks with Configuration Templates - Cisco Meraki Documentation  MS Layer 3 Switching and Routing - Cisco Meraki Documentation 
						
					
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