You can try node instance and select the devices you need to trigger the alert from.
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My recommendation would be to use custom properties. Create an Interface custom property called 'AlertFlag' with possible values of Yes or No. Use the custom property wizard to set all the interfaces you want to be notified on to Yes for this custom property. In your Alert Manager, simply add another condition to the out of the box interface down alert
AlertFlag = Yes
That worked! Thanks! Guac, as always you pull through for me once again!