Those units are marketing at its worst: Hey, look- you just slap this on your house and it's efficient!
Look at those poor things being crippled by being treated as afterthoughts. Nothing special, just a part of the house. We won't worry about how well they can work, just how well it works at what ambient temperature. They need to be treated like solar installs. Nobody would dream of hiding a set of solar panels in the backyard or behind a hedge, but that's exactly what people expect from a heat pump- because you should be embarrassed that you heat your house:
A greenhouse isn't exactly called for, but solid shielding upwind for cold weather is, with deciduous plantings or something else to shade it in the warmer months. Instead of running it round the clock to heat the house, having it feed a heat storage tank in the house would let it only run in the daytime when the sun is heating it up in its little shelter for free. But that would take thoughtful installation and they couldn't brag about that performance in ads, so it gets ignored.