In Otus you can create a seating chart for each class. You even have the ability to add in the location of the door and any boards.
From the home screen, select Classes.
Using the drop down, make sure you are in the class you wish.
Select Seating Chart from the secondary navigation window
To add the door(s) or board(s), click an empty title on the seating chart until it highlights in purple. You will see an option to add a door or a board to your seating chart. You can also drag students around to place them in different tiles.
Now you can see the layout of your classroom and experiment with various setups!