You will probably require around 4 Supports For an average length of shelf the more supports you add the more weight the shelf will be able to Support. Simply plug into a drilled hole or make your own hole to the size you required.
eBay
120/10PCS Self Tapping Screw Layer Plate Holder Wardrobe Septum Brackets Fixed Screws Shelf Support Pegs with Non-Slip Sleeves
Aliexpress UK
Description: Suitable for glass shelf, glass cabinet and other glass funitures. The install screw is included here.
eBay
100/10PCS Self Tapping Screw Layer Plate Holder Wardrobe Septum Brackets Fixed Screws Shelf Support Pegs with Non-Slip Sleeves
Aliexpress UK
Description:1.: The brackets are made of metal materials which is durable, can serve for a longer time.2.Save Space Bracket: Stalling the angle bracket in the wall to hang something which can make the mess in orderly; it can also save space in a limited room and makes the house look tidier and give you a happy feeling.3.Strong Loading Capacity: The angle bracket can provide a more strong loading capacity, more durable; Both sides are fixed with holes, it becomes solid and powerful and don't worry the carrying falling off.4.Countersunk Screw Hole: Countersunk mounting screw holes design makes the screws not appearing outside, protecting the quality of screws and making the appearance more beautiful, better effect of installation; curved design makes the edge smooth and it can also protect your hand from scratch.5.
eBay
Self Tapping Screw Layer Plate Holder Wardrobe Septum Brackets Fixed Screws Shelf Support Pegs with Non-Slip Sleeves Wholesale
Aliexpress UK
Engineered for flexibility and strength, these pegs effortlessly screw into wooden structures, providing a tailored fit shelf-hanging need. 20 x shelf screw pegs 20 x peg sleeves. 10 Pcs Eyeglass Pads Glasses Higher Nose Bracket Accessories Eyeglasses Holder.
eBay
50/10PCS Self Tapping Screw Layer Plate Holder Wardrobe Septum Brackets Fixed Screw Shelf Support Pegs with Non-Slip Sleeve
Aliexpress UK
LOAD CARRING CAPACITY APPLIES TO 4 SHELF SUPPORTS. ( 8 Screw In Shelf Support. load bearing capacity 9.4 kg in compliance with DIN EN 16337:2013, i.e. 60 kg test load). We aim to dispatch quickly.
eBay
100/10PCS Self Tapping Screw Layer Plate Holder Wardrobe Septum Brackets Fixed Screw Shelf Support Pegs with Non-Slip Sleeve
Aliexpress UK
LOAD CARRING CAPACITY APPLIES TO 4 SHELF SUPPORTS. load bearing capacity 9.4 kg in compliance with DIN EN 16337:2013, i.e. 60 kg test load). ( 5 Screw In Shelf Support. We aim to dispatch quickly.
eBay
100/10PCS Self Tapping Screw Layer Plate Holder Wardrobe Septum Brackets Fixed Screw Shelf Support Pegs with Non-Slip Sleeve
Aliexpress UK
[Stable Material]: Our shelf brackets are made of iron, and the surface is electroplated, with high hardness, strong load-bearing capacity, corrosion resistance, and rust resistance for long-term use.[Easy to Install]: No need to punch holes in advance for installation, just screw them into the cabinet with a drill or screwdriver when installing, and they will firmly fix the shelf in place. The shelf nails are equipped with silicone sleeves, which are non-slip, scratch-resistant, and reinforced.[Enhance Cabinet Organization]: Cabinet shelf nails can help you maximize the use of space, improve the efficiency of item storage, and create a clean atmosphere and a tidy space.[Multi-purpose]: Our shelf nails can be used for cabinets, garden racks, kitchen racks, office racks, etc.
eBay
5/10PCS Self Tapping Screw Layer Plate Holder Wardrobe Septum Brackets Fixed Screw Shelf Support Pegs with Non-Slip Sleeve
Aliexpress UK
10 x Tapping Screw Shelf Support Pegs. Design:Designed with self-tapping screws, more and not easy to loosen and wear. Widely used: widely used in shelf holes of cabinets, bookshelves, display cabinets, furniture, closets, wine cabinets, cutlery racks.
eBay
Wholesale 90 Degree Angle Connectors L Joint Brackets Stainless Steel Corner Brace with Screws Furniture Shelves Support Frame
Aliexpress UK