Jung Chul Kim’s patent is an appropriate introduction to the topic as a movable installation.
An anchored cabled hydro turbine can be suitable as a possibly more simple and light mean offshore compared to a raised platform carrying equipment. An option was discussed on Rotating Reel System .
To be efficient the hydro turbine should go fast enough without cavitation concern. Minesto’s turbine (https://minesto.com/) speed is about 8 m/s. Higher speed would be better, for example by using an electric hydrojet (https://en.wikipedia.org/wiki/Pump-jet) as generator.
Imho AWES implementation is more likely offshore than onshore where current ground-based turbines will be difficult to beat.