According to Quantum FFF Theory, The central giant MW-Black Hole only eat dual systems of smaller black holes, also called Herbig Haro systems. HH systems create plasma jets in between which seem to stay put (see: streaks) after both HH black holes are eaten by the central BH. The image (by MEERKAT)does already show some dual grouping HH systems before the creation of intermediate jets.
The main direction of the remaining Herbig Haro plasma jets is perpendicular to the Galaxy equator.
The most natural explanation according to quantum FFF Theory, is that in the Herbig Haro Black Hole Pairing process the Axion/Higgs field vacuum vector array profiles are equipped with an hourglass profile ( butterfly cross section) with the central axis also perpendicular to the Galaxy equator.
As a consequence the two pairing HH black hole will polarize in the same way. see 2e image.