Invisible Hidden in wall Floating Support Concealed Bracket glass shelf
Studlock™ Standard Floating Shelf Bracket for EZ Mount™ - Etsy
Amazon.com: 32 Inch Floating Shelf Bracket - Hidden Shelf Bracket with 150 LB Weight Capacity - Invisible Design for Shelves 32 Inches and Longer - Heavy Duty 3/4 Inch Solid Steel Support
Free Hanging Shelf Bracket – The Original Granite Bracket
I-Semble Heavy-Duty Blind Shelf Supports | Rockler Woodworking and Hardware