The magnets aren't designed to hold the spanner in the holder and the holder is designed to use on a flat level surface.
eBay
Mini Hexagon Ratchet Spanner 1/4 Inch Mini Ratchet Wrench Screwdriver With Batch Head Set Spanner Screwdriver Hand Repair Tools
Aliexpress UK
466mm Length x 40mm Height x 220mm Wide (50mm Wide at narrow end).
eBay
LIBRATON 1pc or 6pcs Ratcheting Wrench Set 6-19mm Ratchet Spanner Wrench Set Universal Spanners with Flex-head for Bike Repair
Aliexpress UK
466mm Length x 40mm Height x 220mm Wide (50mm Wide at narrow end).
eBay
1 Pcs High Quality Sliver Bike Round 8 Spoke Nipple Spanner Bicycle Bike Mini Repair Tool Spoke Wrench Spanner
Aliexpress UK
Keep your tools in place and stop them rolling around with our magnetised base tool holders. Here are our Tool Mob Modular Spanner Organisers. If you choose a colour only the top section is coloured not the entire holder.
eBay
Bike Allen Key Spanner Single-Ended Torque Ratchet Wrench Spanner 1/4 Inch Portable Screwdriver Set Bicycle Hand Repair Tools
Aliexpress UK
Holds up to 12 spanners for easy size identification. Tool Storage. US PRO Industrial. US PRO Tools 3 Piece Magnetic Socket Holder Storage Rail 1/4" 3/8" 1/2" Drives. Socket Sets. Power Tool Accessories.
eBay
45-48HRC C Hook Spanner Wrench Spanner Collet Chuck Half Moon Wrench For 38-72mm Round Nut With Red Non-slip Handle
Aliexpress UK
Fits combination wrenches, offset wrenches, short wrenches, open end wrenches and ratchets. 1 x Magnetic Wrench Organizer. 【Easy to Install】Tool Storage Shelf, easy to install, convenient and fast, no punching design, you can easily complete the installation.
eBay
1/2/3 PCS Trigeminal Hexagon Spanner 3 Way Y-Type Spanner Portable Bicycle Repair Tools Cycling MTB Road Mountain Accessories
Aliexpress UK
80x Magnetic Wrench Organizer. Compact design works well with all wrench types including offset, combination, open end, stubby, and ratcheting. Identification labels included to easily see wrench sizes.
eBay
Torque Wrench With Clear Scale Metric Spanner Inches Drive Torque Spanner For Steel Non-slip 300N/500N
Aliexpress UK
20~80x Magnetic Wrench Organizer. Compact design works well with all wrench types including offset, combination, open end, stubby, and ratcheting. Identification labels included to easily see wrench sizes.
eBay
Mini Ratchet Wrench Set For Bicycle Allen Key Spanner 1/4 Drive Ratchet Handle Quick Release Socket Spanner Screwdriver Bit Tool
Aliexpress UK