The best way to create your workspace and take advantage of all the spaces, you can create your own shelf and easy mount it on your Skadis Ikea panels, just with your printer, no hardware required (just the bracket and you can download it here)

the Ultimate Shelf for Skadis Ikea Modular 880 mm is divided in 4 pieces (220 mm each) and you just have to use the connectors to assemble it. If you like you can print more connectors (5 each connection) and more panels to make it longer), all the holes are aligned.

The best way to join the shelf and the bracket i suggest to use normal double sided tape