Distributions of black hole mass vs. (sub)halo mass (M_peak) according to the models assumed in this work (from Powell et al. 2022), shown with a lognormal color scale. Model 1 assumes correlations between SMBH mass and stellar mass, as well as between stellar mass and (sub)halo mass. Model 2 includes an additional SMBH mass-(sub)halo mass correlation, leading to a much tighter relation between the two.