Can I use multiple EX8000 Mesh routers?

Is it a true mesh in that there's a controlling running the mesh system? no.  It doesn't have anything controlling it. 

Will it work? Yes. But it might take some fine tuning/playing.

During setup, I'd shut off the other EX8000. to get it setup. 

they're not designed to daisy chain. And here's why. In a full mesh system, there's something controlling the system and managing devices and make sure the satellites/ap's are connected properly. The mesh extenders are designed to get around this by simply using the same ssid as the router and having the roaming standards built in. But the problem is that when you're running more than 1 extender, they can connect to each other's ssid (the extenders) because nothings controlling them and then they loop.

It doesn't always happen but if they're in range of each other, its a possibility. Some have it setup running multiple ones and don't have a problem. 

the way around it? Set one of the extenders with its own unique ssid. the prevents that. 

the otherway? Do you best to seperate out the extenders and not daisy chain them.

What I mean is try to set it up this router:

Extender<-----------Router------------>Extender

Try not to go:

Router---------->Extender------------>Extender.

This is a recipe for problems.