You can place Proxy mines inside objectives such as the C4 and the objective you have to deliver (mainly used on Bridge).
The problem with it is not that it’s a very good spot, but the fact you can’t shoot the mines because of that.
Today I wanted to take the objective on Bridge to win the game, I saw the mine thanks to my Bomb Squad augment, but I couldn’t destroy it. I wasted 2 full clips of MP400 and a few shots from my Remburg and the objective just absorbed all of them. I even tried placing my own mine next to the objective and shooting it but it also didn’t work so what I had to do is go behind the objective and activate the mine through the wall. By the time I got rid of it, the enemies already respawned and got back to the room so I got killed
And a lot of times it happens to me that I place a mine inside the C4 and I see a bunch of grenades exploding next to it but my mine is still there. And wise versa, I try to destroy the mine with a Fletcher sticky but it doesn’t do any damage to it
So please, either disallow placing mines inside things, or just make bullets go through them like there’s nothing there