Create Alert on the sum of 9 interfaces from different nodes

I am trying to create an alert that would send an email when the sum of 9 interfaces on different nodes,

i know that this would need to be done with a SQL/SWQL query, i need help in creating this query.

i have found the following pose that shows you can do this from one node

https://thwack.solarwinds.com/t5/NPM-Discussions/How-do-I-create-an-alert-based-off-the-sum-of-the-Total-Bps-of/m-p/362948