The 16 port passive hub is only pixelnet in and out. No DMX.
The 4 port passive hubs are similarly only pixelnet, you CAN'T hook an LE off of them, since there is no DMX out on a passive SS hub. You would need an active 16 port hub to do that.
What I did last year was hook up my SS active hub to a chain of nearby LE(s) (from the SS active hub DMX OUT) ... and at the last LE in that chain, I took the DMX out and put it into a Lynx TX (wireless DMX). Then I used an onboard ex/rx on my remote (satellite) LE(s) ... to accept that wireless DMX signal IN, and if there were more than one LE at a satellite location, just the first LE had an ex/rx and the others were connected via. DMX by wired cat5 cable connection from the first LE (the one with ex/rx on it).
This way the DMX distribution goes wireless and is pretty easy ... and then you can focus on your smartstrings from a pixelnet only point of view ... and could use passive hubs more potentially.
There are many ways to do this, just giving you one example.
Another reason to to go passive hubs might be to lower the size of power supply needed, which can lower costs ... esp. if your pushing a lot of 4amp smarts strings on a single active hub ... because there is a point where a 60a power supply might be $70 ... but a 80a single rail PS might be $170 ... so that extra $100 for another 20a ... might be better used to power a $40 16 port passive with another $40 PS on it running maybe 40a ... maybe not a great example, but it shows the options you have.