A fast and easy way to install kicks is to use 4 shelf support. Install these shelf supports on the lowest and highest holes on either side of where the kick will go. When installing any wood part look at it and decide which is the best side to face out.
If you’re installing on wood flooring the kicks should fit very nicely. However, if the flooring is carpet and depending on how thick it is, you may need to adjust the suspension brackets on the tower portion lifting it a little to give you more room. If this is the case, it’s best to do this before installing a lot of shelves and before you secure using the L-brackets.