For the system you add with the plugin that is what this topic is talking about, you would have to create your own class in cpp and override the default behavior.
Extend gastner wave wave generator simple.
And then change the class in the water body settings.
Possibly, the engine lest you right click and create a child of that via BP too.
You have to play around with it.
Changing the wave generating algorithm or the wave source might be all that’s needed.
At least check to see if there is any existing multi-player options for it.
If not, override the class and set the time yourself. Also make sure the material uses the same value.
You may need to modify it to get it to.