I think like others rearrangement is half the fun.
One is pretty much the base unit that is always in the mix.
Two are 2U and are rather focused.
The current setup is here.
Telegrid is the one I always have handy. But as @scanner_darkly pointed out, building a small special purpose one is a lot of fun so these change pretty quickly. As I said in my original post, and he said, having 2-3 that you can repurpose is kinda the point.
The reason I want to ‘lift’ one is because my desk isn’t deep so if I’m at the computer I want two tiers - a 2u below and a 1u above probably. Going to experiment with that this weekend.