An uncommon solution to labeling. Most retailers would use extruded label holders that clip along and grip the shelf edge. Here label holders for the item below, are glued to the bottom of the shelf above. Since there wares are displayed below a counter, the only advantage I can think of is that the placement is higher and better catches the eye. Still, a shelf edge clip mount Label Holder could do the same as this total bottom-mount. CLICK the thumbnail for a second look. Note the round-cornering to reduce snags on customers reaching beneath for items displayed below

For shelf-edge clip-on label strip examples see…
“Do You Shop Size or Price First“
“Lazy Susan Label Holder“
“2012 Tiny Label Holder Award“
“Backless Label Strip On Glass Shelf”
“Clear Label Strip for Crystal”
“Label Holders in Opulent Acrylic”

And for not such a good idea maybe…
“Glass Shelf C-Clamped Strip“