The spice rack is annoying to place. When I first started I ended up having to completely redesign that half of my kitchen to make it work. My kitchen had originally looked like this:
https://steamcommunity.com/sharedfiles/filedetails/?id=2614196408

but I had to take out the stone on either side to widen it and then still had to put the rack basically inside my chimney on the edge of a beam for it to both place AND be close enough to the cauldron to actually apply the upgrade. Which for whatever reason, I never thought to take a picture of after the remodel.