This is a piece of cake with the Suspension upgrade for Karnesis.
Enemies will hang in the air completely still for a couple of seconds - allowing plenty of time to get a headshot.
You do not need to kill all three in one use of Karnesis, you can do one at a time.
To get upgrades for Karnesis keep killing the Visionary with Karnesis and loot their upgrades.
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