This kind of thing is very easy to DIY. Buy some boards a bit wider than your widest knife, cut them to a bit longer than your longest knife, sand cut ends and corners/edges if you want, and nail or screw to a base and back:
I like it because I can keep it under a shelf and still take the knives out.
I like the look of this! I'd use it for my many less frequently used knives or a similar version that would lay flat in a (drawer). The layout would be good to fit a lot of knives in a small footprint.
This is an old pic but it's what I currently have, had it custom made by a local woodworker after doing the research and testing with the magnets myself (okay the r&t was super easy, just wanted to sound hardcore lol):