I have seen some posts where people are concerned about Z-Wave and Zigbee dongles close proximity when plugged into their Pi or NUC. I don’t know that it makes any real difference but I moved mine away from each other using a couple of these.
UPDATED LINK
This is just an example of what it looks like I am sure there are other purchase options out there.
I don’t know that it makes any real difference performance and have no way to measure it but what I do like is I have my NUC mounted to the back of a bookshelf and just have the 2 USB’s (Aeotec & Conbee) sitting behind some framed pictures on the top shelf so you don’t know anything is in the room.