Before my last divorce in 2010 I built a rug cleaning room in the shop in 2001 with a wall mounted staircase style drying rack. I wrapped the five 2" x 10' galvanized pipes with antislip rug pad. They hung in place with a blower on them and never moved. 1 dehu in the 10x15 room would pull down 5 freshly washed rugs overnight. Maybe this will give you some ideas.
Yes, but this is at the bottom of the rug. The main purpose is that any water left in the rug (which will always carry some soil) goes down into the towel instead of the edge of the rug or the fringes. Stops fringes from turning brown. This also distributes the weight of the wet rug across many wefts instead of concentrating the weight on one weft line which will weaken. Several other benefits as well.