Any powered aircraft large enough to carry a person is inherently noisy and dangerous. All serious vertiport proposals I have seen for quiet electric aircraft a

Any powered aircraft large enough to carry a person is inherently noisy and dangerous. All serious vertiport proposals I have seen for quiet electric aircraft assume a dedicated facility at least as large as a city block. And even those are only feasible if there is no significant NIMBYism in the area. Rooftop landing pads could work, at least in principle. They are however risky enough that Western cities often outright ban them in urban areas or limit their use to emergency situations.