Connecting my own router - which unit do I connect to?

[wireless]

When my purefibre was installed a few days ago I asked the installation tech which unit should connect to if I decide to use my own router, which I have decided to do so I can create my VLANS ect for new IoT connected devices, keep using my existing customizations in my dd-wrt router etc.

He said to connect it to my NH20A unit and not the Nokia unit the fibre is plugged into, but I am not sure if he understood my intent clearly. Right now I have the Cisco (linksys) just operating as a switch and ethernet goes from the NH20 to my nearest switch, but I'd like to swap that switch with my router and have the router first in line.

Can I run ethernet from the Nokia unit direct to my router & bypass the NH20A unit?

Or if I keep it connected, would this be just like using two routers on my home LAN, which would give me the ability to have two physically different LANS?

Thanks in advance




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