I got one from Lidl last year, just under £30 and very similar to 3rd one in your links. I am very happy with it, good enough for home use, probably not robust enough for a professional bike mechanic/bikeshop. Your Dahon will fit fine, clamp it in using the seatpost. Before the bike stand I used to service my bikes by mounting them upside down in a Black and Decker workmate and clamping the bar stem in the workmate jaws. The work stand is a much better option.