Folding door system to divide a room

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
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