@maxhest Threatgrid from what I have read isn't cheap. Its based on the amount of users and amount of file uploads so licensing varies a lot depending on your needs.      https://documentation.meraki.com/MX/Content_Filtering_and_Threat_Protection/Threat_Grid_Integration#Threat_Grid_and_Meraki_MX_Integration ... View more

As long as you create the /30 interface on the switch first, it will correctly use that as the default route for all other L3 interfaces you create. You should still set the MX's gateway as the /29 block IP you assign to the MS225 though.  ... View more