The corded tracks are made to be operated by cord.
mine are adjustable between a inimum and maximum length.
yes they are wall mounted, but most tracks are, unless you buy theatrical track.
colorama is a brand name but is a sort of durable cartridge paper supplied on a roll.
The idea is that for fashion shoots, you might have a white roll, on a cardboard tube, pulled to the floor, then allowed to form a curve, then it covers the floor.
the curve gives no indication of depth - often called an “infinity curve”as you can’t percieve where the floor finishes or the wall starts. The part that gets damaged by being walked on normally gets thrown away, the roll carefully rolled up and used again.
for you, you could carefully roll down to the floor and tape it, rolling back for tension.
a simple 3M long wardrobe style pole could support the paper as the tube it comes on is quite solid.