Can anyone recommend a folding door system to divide a room approx 2.8m
wide?

Local merchants and most online only seem to have a 'Slik' system
(manufacturer) which seems to be more for wardrobe doors. But there is
an alternative one manufactured by 'PC Henderson'

I want to use either melamine chipboard or hardboard pressed face doors
- in either case about 500-600mm wide.

Will these be OK suspended off a top track only, or is a bottom rail
necessary too? Usage will be several times per day.

cheers

dg