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You can put them in the water with just an anchored buoy.

Then you have to connect them all with sea cables, those add up if you need another km for every base you install.

Yes, preferably not too deep water. Still better than trying to keep a windmill-like turbine upright (those exist, but look complicated https://www.sierraclub.org/sites/www.sierraclub.org/files/st... ).

edit: oh you mean for the electricity, yes...