The centre of gravity in a flat Earth system would be near the middle of the large plate. All of the water would pool around the centre of the plate forming a large spherical ball of water. All of the land would also feel titled at an angle because of the gravitational field which will be spherically symmetric.
Kind of like this image from my cube Earth post:
https://steemit.com/steemstem/@procrastilearner/what-would-a-cube-earth-be-like
Lol you're obsessed! You should push it to your country's leader to do more research. But as I said, the idea is gravity doesn't exist so your ideas are bunk