It might be worth considering if there is somewhere that it simply wont be seen.
When I had a board up in halls it was in a small storage room which had the hoover etc in. During inspections they would open the door, check that we weren't hiding banned stuff in there and move on. They would never take a step in, turn around and look up... and as the whole place was just painted breeze blocks the board went up on two expansion bolts, super easy!