Yes, mine have rows of little holes where you put little metal tabs that hold up shelves. The holes are about 3.5cm apart. But some of holes can get used up by the door hinges, so it is not 100% flexible.

Axiom M80s + QS8s + VP180 <-- Pioneer VSX-1120-K <-- Squeezebox Touch / XBox360 / Oppo BDP-93