Here's one made by Franke (link below)

This is a bit limited, I have seen other arrangements where there is long slit that could hold many knives along the back of a counter, behind drawers. Good option if you have 30" deep counters, you could have a "normal" 24" deep section with plenty of room behind drawers for knife slots.

Use your imagination to work out something similar.
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Here is a link that might be useful: Franke counter mounted knife storage thingy

Thanks. That might work. What I saw had something similar to sand that the knives just went into...

The Kaboosh or whatever that is called actually has plastic rods buched together and many poor user reviews. It seems it can't hold many knives and is less functional than it seems at first.

Check out the Edlund one. Someone here used it years ago and I never forgot it. It is cheaper and larger than the Franke.

Here is a link that might be useful: in counter knife rack