You should be able to set up the users with access to certain cameras and/or feeds, so that they can log in and access the Vision Portal and leave it up. I know this is 4+ years after you posted this, and you may already know this, but there was some problem that was just resolved in ver. 1.22.1 of the Vision Portal that was either still a problem causing idle timeouts, or had been previously fixed, then returned as problem -- https://documentation.meraki.com/MV/Viewing_Video/Meraki_Vision_Portal_Changelog
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