These DMBHs, seem to be subjected to singular external gravity pressure from the oscillating (Casimir related) Axion/Higgs field see:
Emergent Pressure
Gravity by Dipole Repeller Rigid String Pressure the Origin of Non Inertial
Black Holes.
Secondly Non baryonic matter ( DMBHs) should have no mass and no inertia effect, it has only singular pressure gravity from the oscillating Axion/Higgs field .
However DMBHs also seem to be able to produce baryonic matter by pair production (and quarks) called: plasma at the baryon repelling horizon.
As a result, in contrast with standard science, all DMBHs are equipped with a small or large electrical charged plasma cloud which is located inside a narrow horizon around the DMBH.
The electrical charge of the plasma horizon is assumed to be negative at the outside and positive at the inside, only inside our material universe, which is part of a symmetric raspberry shaped bubble multiverse.
Plasma tail propulsion and BH pairing and splitting process to form Herbig Haro systems with star forming in the middle of two DMBHs. like our sun. see below.
DMBH gravity difference with Baryonic gravity effects like neutron stars.
see also:
The Magic of Life-
and Matter Creating Self Propelled Electric Dark Matter Black Holes Guided by a
Holographic Entangled Symmetric Multiverse System. See: