@terziyski Thanks for the reply.

I want to use Homeshield for the features it gives me I cannot get from other firewalls so it's going to stay regardless.

It sounds like your saying it will still work to use both with the double NAT. Can that cause other problems?

I guess I was more asking if having a firewall between the homeshield enabled router and my modem is likely to cause any issues with homeshield phoning home or if it might be pointless because homeshield tunnels straight through/past it....I'm not really sure how it works!

I'm also open to other suggestions. I have many reasons for wanting a separate firewall, but one of them is to potentially protect against any abuse that could come from TP-Link themselves (intentional or unintentional) through the use of Homesheilds link to my router.

Thanks