There's a small gap between the side of the door, apparently you can place a landmine in between there.
Video shows how to place it and what map this works on

[Video: http://https://www.youtube.com/watch?v=fuojjW9sLgE]

Here are some additional spots I found, should work in TDM & FFA

[Video: http://https://www.youtube.com/watch?v=oNaD9OScIjY]
[Video: http://https://www.youtube.com/watch?v=6NZX_ROQ7jk]