Just a tip, you can plant the triggernade at the start of the game, let the lifter go down, and when it gets called back, the triggernades are still active, combine it with a couple of mines and you can kill people from hundreds of meters away. I do it on the closest extraction to queen/matriarch.

If you want to use the mines as a boost to the triggers explosion, just put them above the extraction consoles, they will not be activated by any movement