The modem part of the kit, which arrived yesterday, is designed to be outdoor mounted. I've got it up & running hanging inside an upstairs window, using some spare action camera mounts. It uses PoE & a flat ethernet cable to connect to the supplied Eero wireless router. I will get the ladders out later & see about finding the best outside location, which I expect to be fairly close to where it is now.
It is already better than the (now fixed) ADSL. Although that is a low bar, as I reckon we've got around a mile of copper, despite being on FTTC. Ironically the cabinet isn't significantly closer to us, in a direct line, than the exchange & the copper wire has a somewhat convoluted route from there to us.
"The problem with stuff that is meant to be idiotproof is that it immediately stimulates the development of new and improved idiots"