How to set up a game start area with various actor placement options

Hi all,

I am trying to figure out how to set up a game start grid area like you see in the game “Battleship”.

As of yet i am able to set up multible points without a problem but i am struggeling setting up a 10 by 10 grid, designating specific locations so the player can choose where to place the actor…

Thanks in advance…

C++ and Blueprint Method.