Sub-sample selection. Left: distribution of the fraction f_VPOS of Monte Carlo realisation for the orbital poles of our systems that are found within the VPOS area (i.e. within θ_VPOS = 36.87° from the orbital pole of the VPOS normal). Right: distribution of the V-band luminosity values for our systems as a function of their Galactocentric distance. In both panels, the on-plane systems are plotted in orange, the off-plane ones in blue, while systems with intermediate f_VPOS are marked in grey. In the right panel, they are plotted using filled triangles (pointing up or down depending on whether a system is co- or counter-orbiting within the VPOS), circles and squares, respectively. In addition, black circles indicate the MCs and likely associated satellites, while green circles mark those systems that are in the off-plane sample independently of their proper motions.