Mines in small groups instead of used en masse are really only good for harassment and a little attrition.
You cannot defend anything with such means, but your can demoralise and it takes resolute leaders and some urgency to avoid a major mine-driven impact on operations.
Such mines aren't even serious obstacles, much less defended ones.
As an Austrian I would have a close look at a very, very different kind of mines; proper engineer demolition work for avalanches, collapsing bridges, closed-off tunnels and bursting dams. The isolated conspicuous object next to the road would be relatively insignificant and inefficient in your terrain.
Of course Austrians won't fight at home any time soon, but once the EU is under attack they would be expected to be among the few mountain warfare experts available to the EU.
(I'm the guy who thinks almost only about wars between great powers as scenarios because those are the problem; small wars are despicable games by politicians.)
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