Zabbix Alerts, Grouping by site

I’m trialling on-call and have the zabbix integration setup correctly and working.

I am looking at ways to group multiple alerts for when a remote site router or internet connection goes down, so i dont get a ton of alerts from the devices behind that router. Im thinking i could tag all site devices with a tag representing the site and use that to group by, but wondering if someone has come up with a sensible way to achieve this?