Is the water inversion aimed at a certain constellation or all constellations?

Mercury retrograde generally has three sides, accompanied by four positive constellations.

For example, Mercury Sagittarius is retrograde.

Sagittarius is affected.

Its Aries and Leo are at 120 degrees.

Gemini 180 degrees

Virgo and Pisces are at 90 degrees.

30, 60 and 150 degrees have little effect.