I use bc-protect command for my "lobby" that everyone spawns in. "bc-protect x y x y true" xy and xy being the coordinates of the top left and bottom right of the square/rectangle you want to protect. It protects all of the Z axis by default. I have the certain commands run on RATS startup as this is only while that instance of the server is running.
use "listplayers" in console and use your x and y from the x, z, y cords that you get from running the command as you move around the area you want to protect to get the 2 points you need. Grab the 2 points you need for the command and then run it in RATS console.
EDIT: oh this is different. Interesting.