As parents of a five-month old, we've been washing and drying a lot of bottles. I bought a Munchkin High Capacity Drying Rack for holding all of the baby's bottles and other assorted feeding gear.
Unfortunately, what I've found is as the upper shelf bears more weight, it puts enough pressure on the center column's tabs and the shelf eventually collapses down onto the lower shelf.
Over time, this got pretty annoying. Eventually, I grabbed my calipers and designed an object to manage the height that the shelf sits on top of instead of using the flimsy little shelves.
QIDI TECHNOLOGY 3DP-QDA16-01