Use Schu mines like soviet mines. I think they're the exact same mine except visually
I like to put mines on Crossroads or roads in general since vehicles tend to path themselves on to roads by default.
It's also funny to put a mine in a doorway, against a guy that likes fallschrimjager, or put a mine on Ice on maps like rzhev winter.
Putting s mines on distant flank points that an enemy may not pay attention to while sending a Squad to cap is always good
this is a little of hit and miss. sometimes, i believe models spawn sequentially one after another. so i had times where falls stepped onto a mine as spawning, but only one guy "spawned" yet, so only he died and others were just fine. and killed my purposely parked katyusha near a building.
--------------------
anyway, i like defensive mines. a lot of aggressive mines are detected too easily by ppl who uses mine sweepers.