Not sure how much research you've done, but you'll need to push/install these profiles after the Mac is on Mojave (never before). The PPPC profiles will happily install if the Mac is on an earlier OS, but nothing happens b/c it doesn't know how to enforce prefs that don't exist yet. If the Mac is subsequently updated to Mojave the profiles don't get magically refreshed or enforced, so you have to completely unscope the tag to remove, and then rescope a tag to reinstall.
PPPC Utility makes it easy to create the profiles, then just upload the .mobileconfig to Meraki.