My DBA board has a wooden frame around it. I cut a small notch at the halfway point and 3BW on either side of the halfway, all around the board. I then took a piece of twine, cut to just overhang the frame, and placed two fishing sinkers on the twine to weigh each end down. I made two of these weighted markers.
At terrain deployment, I hang the markers from the halfway markers to give the four quadrants. At troop deployment I hang the markers across the 3BW points. As my terrain is flat and my trees, buildings, scrub are free standing, they are just added to the base after depoyment.