The solution to dispersal, and density, is to simply allow that type of building everywhere, and then they just kind of randomly pop up whenever/wherever works out.

Unless forced to due to scarcity, dense development does not really clump up together all at once for good reason, since clumping up will drive up costs in a hyper local area. Tokyo for example, has a lot of detached housing, even in the central wards. The density there is more pockmarked and random, and notably never really concentrates all that highly; there is not a single Japanese building in the top 100 skyscrapers, because skyscraper concentration is an artifact of how we force dense developments only in certain places.