In the open sea the tugs could perhaps be replaced with Syroco devices for records, in order to eliminate most of the hydrodynamic drag and the mass and volume of the multiple tugs, the respective flying floats being only used to store then launch their respective kites.
The deployment would be in two stages: the Syroco devices, contained in compartments of the ship, are ejected; then the kites take flight, first towing the devices to their respective locations before towing the whole.
That said I think using only one ship and increasing both kite area and tether length is simpler.
Besides that, see also THE KITESHIP™ PROJECT -CHAPTER 5 IN THE CONTINUING SAGA alone or in combination with the previous.
Dave Culp
Ron SwensonA video:
Also produced electricity could lead to make e-fuels (Electrofuel - Wikipedia).