Multi-port would be ideal - the biggest hurdle is cost - duplicating a fuel system that handles water. This includes an injection manager, distribution of pressurized water to each port, installation of jets at ports, etc. Certainly an Aquamist 2s can handle this and the guide for the 2s discusses multi-port applications.
While the question of even mixing is always a question with dry flow manifolds with a sufficiently long induction system throttle body injection of water thus far has been at a minimum adequate for most applications.
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