Technical aura to provide a frame anchored to the target nameplate (hidden if no target nameplate).
It differs from other similar alternatives by using events instead of updating every frame, which significantly reduces CPU load.
On its own this aura has no display. It's useful only as a helper to your other auras.
In your other aura set Display > Position Settings > Anchored to > Select Frame > paste WeakAuras:TargetPlateAnchor
Screenshots demonstrate a separate aura (which is a simple red circle) anchored to the target nameplate.