Hi,
I have done something similar recently with Psunami:
https://www.neks.tv/Boat_Parade.html
Here I had to duplicate the boat layer together with those lights and scale the height of the new layer to -100 and then link all the boat layers to a null layer so that I could move the boat more easily.
On that layer you need to apply the displacement effect and link it to the water that is the layer with psunami effect on it.
You can see that the sun is also in the upper right corner but I didn’t move the camera so I’m not sure about that other stuff.
Hope it makes sense
Nenad
http://www.neks.tv