If you are extremely paranoid about it, you can use an old PC and PFSense Linux to make your own super powerful NAS Router.
Just pick up an old PC and stick in a couple Ethernet Cards, and Wifi Adapters, load in PFSense Linux and set it up however you like... ain't nothing going to get past that.
I was waiting for a response like that to come in... I have known people to do things like that on their home networks. While effective, I think that is overkill... like trying to hit the bullseye on a firing range with a NUCLEAR WEAPON.
And as I said, there can be other benefits,...
I enjoy using Squid and just wandering are using in transparent mode?