I had also been looking for a solution for 600mm high corner cabinets and I have a solution to offer. I was already somewhat annoyed with Suzie.Bode (see above).
First consideration: Shorten the glass shelf at the back. Triangle 15x300mm. Unfortunately, that is not possible. The glass shelf is ESG (single-pane safety glass). It cannot be cut or ground. (Information from the glazier). For wooden shelves, that would be a solution with adapted dimensions.


Solution for glass shelves: Cut into the back panel.
The cutout must be of varying size depending on whether one or two glass shelves are to be installed. I have attached a few pictures, hope it works.
Sequence:
Mark out and cut out the cutout (multi-tool)

Smooth edges (front, back, also the cut-out strip)
1. Insert the glass shelf and place it on the floor
2. Insert the glass shelf and place it in the highest position using the support pins
1, place the glass shelf in the lower position
Apply double-sided mounting tape to the cross brace (approx. 8-10cm length), pass it through the cutout and stick it to the back panel from behind.

Glue in the strip
Cover with D-C-Fix foil.

I am glad that I did not have to dismantle the wall cabinets.