i had read that it would be ok, as long as you added small angels to the tank (ie after the neons). so i tried it. i currently have about 15-ish neons with 10 dd's. no issues among them, and i like the color contrast. (in your case, maybe adding the neons during a major wc/re-scape/trim...)
my tank is also fairly well planted, which i believe helps a lot. also, i enjoy 'fewer' fish which may contribute to little/no aggression (dunno??). dumping a dozen angels and 25 neons in a 90 isn't something i'd recommend.
in your 90g/5 angels/planted, i think you'd be fine imo.