Service check alert doesn't appear in the dashboard

Hi Guys,

I’ve this alert set, for some reason when I drop connection to both hosts , the alert isn’t triggered please advise

You can’t check two IPs at once

Got it , now it works. so in that case it might have false positive alert, is it any way where I can overcome this?I want to sample several hosts on the internet to be sure that the issue is real, as one host might be unavailable