Saw another Redditor post something similar. I also joined two shoe cabinets (Bissa) and attached a stained wood board on top. I love the way it turned out! : r/ikeahacks
BISSA Shoe cabinet with 2 compartments, white, 49x28x93 cm (191/4x11x365/8") - IKEA
BISSA Shoe cabinet with 3 compartments, white, 191/4x11x531/8" - IKEA
IKEA Bissa Shoe Cabinet Assembly | By Store Professional - YouTube