What makes the landmines great is that you can craft them to look like nearly any block on the surface. But just below that layer is the full TNT block. And even better is these TNT blocks will detonate in 1/8 the time a normal one will. Hide your mines under cobblestone, wool or even the shoreline.
Most of the blocks are available to disguise your explosives and so long as you know where you placed the mines you should be in for a treat with this mod.