There's that bit in an episode of Red Dwarf, that may or may not have been a collective hallucinated memory of the crew, where they talk about a series of mechanoids (servant androids) that were "too human" looking and which unnerved customers.
The result of that was that they made their next series of mechanoids look like Kryten, with the low-poly heads on a similarly angular body.
Even if it was a false memory, the logic is absolutely sound. You want your 'bots to be at the other side of the uncanny valley, not at the bottom, creeping all horror-show-like up the side towards us.