They also have a rack mount kit for the MX65, which should be the same form factor as the MX68. https://www.rackmountsolutions.net/cisco-meraki-mx65-firewall-mounting-kit-rm-ci-t5/ No guarantees, but it looks like it should work.
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You need to contact Meraki Support and have them enable this feature on your account. It is not available by default for some reason. Jeff Bright
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