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They keep in a pen with a slanted floor with a small hole on the low end with a catch pan underneath. much like the way commercial egg producers gather eggs.
Yes, often they have wire floors in the pens with a slanted, metal pan underneath, that drains into a container. Care must be taken to clean the cages daily to keep feces and food residues out of the urine or it will literally spoil. Pure urine can be bottled and kept at room temperature without going bad for years.
What the animal is fed and when also makes a difference. Those that I know that collect fox, coyote, and bobcat urines seem to only feed meats and animal carcasses and report that the winter urine is high quality, the summer is not...