Number of devices, adding new, and best ZNP

[Craigzyc]

I'm trying to find some answers about this but there is so much information spread across so many projects so its hard to get good information.

1. What is the best ZNP to use for this that will enable zigbee 3.0?

2. How many devices can be directly attached to the coordinator with each chip?
   I can't seem to find any good information on how many devices can be attached to each znp? Is it different depending on the znp? Can the cc2538 support more than the cc2530?

3. What is the most stable hardware for an industrial network that needs to have very reliable communications?

4. What is the current state of adding devices through routers on zigbee 3.0?

5. What is the largest network anyone has been able to create with this software which was still stable?