Can’t place a cupboard on your second floor after placing one on the bottom because it’s within range? Do the opposite. Place one on your fourth floor, then one on the second, then one at the bottom. Since cupboards don’t protect downwards anymore, it’s possible \o/
P.S: Oh yeah, I’ve done this. And people called me a hacker while trying to raid me because “Rabble rabble rabble you couldn’t place several cupboards in a 2x2 tower rabble rabble rabble I’ll report you to the admin, EAC AND THE FBI!” Silly sods. (I’ll give a virtual kiss on the cheek to whoever understands this reference)
BUT THAT’S NOT IT! Since your main cupboard is at the top, the second one in the middle and the last one at the bottom, they can authorize at the bottom and STILL BE BLOCKED WHEN THEY REACH A HIGHER FLOOR. And you can do this with as many cupboard/floors as you want. Be creative. Make people hate you for being clever. BE LIKE ME. GET ALL THE GIRLS!