This document will cover the STP guard settings in detail and when they would be recommended: https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Configuring_Spanning_Tree_on_Meraki_Switches_(MS)   In this case I believe your current configuration follows best practice using Loop guard with UDLD on any of the physically redundant links.  ... View more

Oh yeah, that works!   But think about the firmware upgrades, not just replacing stack members. Smaller stacks allows for more room to staged upgrades.   In any case, what matters most is your use-case. Like you said, this is an access layer deployment, not a high bandwidth server/SAN setup. ... View more