A rack system for a cooking appliance cavity includes a first support unit including a plurality of rack support bars and a first connecting member defining a body portion having the support bars coupled therewith, a first end with a first post and a first stepped segment between the first post and the body portion, and a second end with a second post and a second stepped segment between the second post and the body portion. The system further includes first and second mounting blocks, each defining a channel and a notch extending intersecting with the channel such that a first portion of the channel is open and a second portion of the channel is enclosed. The first and second posts are respectively received in the second portions of the channels of the first and second mounting blocks.