After setting up the snapping grid to the board we found that the doors collision would not allow models to be placed next to it, they only way we found to get around this was to make a small plane under the door for a collier mesh. It makes it difficult to select the model of the door you have to select the very bottom of the model to select and move it, but it allows models to be placed right next to it. I suggest locking it in place with the (L) hot key when you don't need to move it.