I tend to bunch them up in pairs of three and hide them behind stuff. Simple really. Worked for me in BF3 with mines. Though I've switched to just using Slams now. More versatile than mines.
Oh wait, AlienTaker, take a look at what I just found, its a Slam with your name on it....wait...wait....there much more in here!!
Just kidding, know its annoying when a bug ruins the game for you.