I use racks that belonged to a great aunt, but if I had to buy some now, I'd probably go with the 3 tier Wilton set. I've been pretty happy with Wilton items, and the tiered design is nice.
https://www.amazon.com/Wilton-3-Tier...s%2C169&sr=8-4
My mom always used paper bags flattened on the cupboard. I have 4 racks, two are better than the others because they have a smaller grid.