Below: Globular Clusters around the MW and Andromeda. or GABHs. (Galaxy Anchor Black Holes.
These GABHS are the remnants of the dual 1st. 2nd. .and more Herbig Haro Black Hole systems forming smaller galaxies, later able to merge with our Milky Way. and stay mostly outside the disc. . see also: https://www.flickr.com/photos/93308747@N05/with/52795666978