Full Idea
The debate between Platonists and Aristotelians about universals is not a debate about the 'location' of the properties, but about the ontological independence of the properties from their instances.
Gist of Idea
Aristotle is not asserting facts about the location of properties, but about their ontological status
Source
report of Aristotle (Metaphysics [c.324 BCE], 1082) by J.P. Moreland - Universals Ch.4
Book Reference
Moreland,J.P.: 'Universals' [Acumen 2001], p.91
A Reaction
Of course, assertions about their location might have strong implications about whether they were ontologically independent.