I set up a 10’x20’ net on ceiling casters in my garage. My ceiling is around 9.5’, but the net sort of stays bunched up and barely reaches the floor. Stretching it doesn’t help as it just springs right back.
My thought was to put a heavy cord/rope at the bottom, but I also need for it to be flexible enough to put to the side, bundle up and tie together so we can park our car. The ones I thought would work ended up being too rigid and the thinner ones don’t weigh much.