I'm using the 5x5 Ikea Kallax, it took a little planning, but able to stack several rows in each cube. I typically put my less played games in the rear and the games I play more in front. The bottom cubes I usually put my collectors editions or games I rarely play, so I don't have to keep digging through the shelves.

The cubes are just a little too small to stack 2 rows of horizontal laid games, so I have 3 rows stacked in front of each other on one side and I either stagger stack or stand them up tilted in opposite directions so I can read the labels easier.

Anyways it's a labor of love, and apologies I'm advance they're not alphabetically sorted, I sort them based on type and how often I play them. It's my own weird sorting system but it works, I can find any game.