I think their ancestral home is the woodland floor, foraging among leaf litter but they can be surprisingly adaptable, much more so than the dunock, which seem happy enough with their place on the ground, cleaning up the fallen crumbs from the feeders above.
The robins that visit my garden have now taken to eating suet pellets. I have mounted the window mounted feeders on up stairs and down stairs windows, they eagerly wait for me to fill them up every morning. this allows me to watch robins + blue tits and great tits at very close up from behind the glass and if I get up late, they actually tap on the glass and wake me up!