I use 2 of these things as shelfs on my mixing desk. I was finding a solution for mixing desk for very long time. Appropriate solutions "in box" were overpriced or undeliverable (to Russia over customs) or unsuitable for my needs.
Once upon a time I saw a table in shopping mall with iron legs and wooden tabletop. That was it! FOR 60-70 EURO! But I needed to organise my gear in some kind of slots, shelfs.
Fortunately, Thomann sells a lot of such stuff, and 2 pieces Thon Multiflex provide me 8U of space, which are in use with Drawmer 1960, Clarett 8PreX and other 4U are in use for little stuff like PRE-73, laptop etc.
These modultracks provide additional sustainability the whole construction with table. I also attached a monitor mount on them, so now I've got very cheap but useful working place with 8U for gear, DIY shelf for MIDI keyboard (Novation49).
Table - 65 euro
Modultracks ? 2 ? 89 euro (now it costs 105 euro) = 170 euro
DYI midi keyboard shelf on the runners attached under table = 130 euro
monitor mount = 30 euro
Total for flexible and usable very mixing desk is under 400 euro.