@JoyriderBC 

Thanks for reaching out to us. 

It is recommended to connect deco unit to your Enterprise class router, then set up deco network. After that, change operation mode of deco into access point mode in deco app. 

If you don't want internet on mesh network, you can disconnect deco unit from Enterprise class router, but you can only locally control deco network. And if deco network has some issue and needs to be reconfigured, you have to connect deco to a router/modem/modem router to finish set up.