The Draytek Vigor 130 is truly zero-config. But you could order a modem from AA and they would preconfigure it for you anyway? They preconfigured a ZyXEL VMG 1312-B10A and shipped it to me. I adapted that config slightly, and used it as the basis for the config in all my many other modems, but configured as needed per-modem because they have to differ unfortunately, as they are destined for duty in different ‘slots’, ie. as intended for which one of the lines.
(AA has a config design that I don’t like so much on balance, but it has the great advantage of not requiring you to have different modem configs per slot/device and to have to keep them straight. Mine have to be labelled. My spare modems are sometimes preconfigured for some slot or other which is bound to be the wrong one on the day, so not much point in it. They work fine if configured with the wrong slot as far as talking to the internet goes; it’s just that I can’t talk to them and monitor them in situ. Luckily I have an iPad program to configure modems appropriately per slot and that completely automates the whole config part of the process. Still have to faff about with setting IP source addresses, getting the patient in the right subnet so I can even initially talk to it in order to configure it, and so forth.)
[Moderator edit to correct a typo.]