I made frames for each of the shoe cabinets. I used 1/2X2 mdf strips.
This shoe storage is metal, so to attach it I used PL3 Loctite glue and clamped them to the metal to hold the frame together.
Once they are set, I attached the shoe cabinet to the base with the same glue.
*** I apologize, I got a new phone and the footage I filmed to frame out the shoe cabinet is gone. This is the only picture I have to help you guys.***
I also attached the baseboards to the base.