I'm not sure how you solve this. They stock products that are smallish, and easily convertible to cash, so robberies are going to happen. The Devialet speaker in the article is a good example. Retails for over $3k, and weighs 12kg.
If you check out jewelry or other luxury goods stores, they generally have
- concreted in pillars to prevent cars smashing into them
- a combined doorman/security person (you know the type - 6 foot 4, tight suit, earpiece)
- an airlocked doorway (possibly even a locking revolving door)