Instrument Racks and Vertical Navigation

So, I can set up a knob to scroll left to right though a selected instrument within an instrument rack. But I can’t figure out how to scroll from top to bottom (or in reverse) through various instruments in a rack. Is there no command for this?

I’ve used the selector chain in the past in Live (before purchasing Remotify) but was never really all that thrilled with it as a solution. Perhaps it is better when integrated with Remotify.

What’s the best practice to be a able to navigate the instrument rack both horizontally and vertically?