No I just use them on the same Zigbee mesh network. I tested some Xiaomi products for many months and found in my testing that the Xiaomi products operated really well with the Nue switches with not a single drop off. After looking online it seems the Nue switches are effectively rebadged Zemismart switches so both are Chinese companies so maybe they are aware of eachother who knows..
Agreed if your running other types of Zigbee devices in your home then it's deemed high risk and you need to test to make sure they work as expected for you before you commit or look at the below thread that outlines what people have tested with and have them working with. You can also deploy Xbee routers I have 1 as I was initially looking into that but then I found the Nue switches were working so I gave up on that idea. Anyways the Xbee thread is below I suggest taking a peak anyways as Xbee's are super powerful.
The other thing that has gone super quiet was the release of new Xiaomi zigbee 3.0 products. I'd imagine this would also resolve the issue of them dropping off most networks so maybe keep an eye out on this too.
