How does the 10% crit from Icicle Mines work?

So the line reads "each mine applies 10% increased critical strike chance to hits against enemies near it, up to 500%". Does this mean its more efficient to do lets say 10 at a time, or is it numerically the same as the classic spasm gameplay of holding the mine button and hammering detonate? I mean obviously I frontload mines for bosses and stuff, but when I don't oneshot them, how should I handle it? (Also im running controlled destruction, if that matters..)