From memory in my training it was something like 300ft close the throttles landing ahead, above that and blue line then feather, and when above something like 1500ft continue the drills for basic troubleshooting
And therein lies the problem for a candidate undergoing dual instruction on his initial twin engine piston type. Every instructor has his own opinion or parrots what he was taught by his first twin instructor who in turn parrots what he too was taught and so on. Lots of opinions but few facts. We see that for example in the differing instructor opinions on minimum height for an asymmetric go-around; yet rarely is that mentioned in the manufacturer's handbook, AFM or POH. Most POH cover the basics of engine close down but nothing specific about the need to feather before the prop reaches a critically low rpm
The purpose of the opening post was to remind instructors that swifter than normal action is required to feather the propeller of a failed engine that has packed up due to a major mechanical fault. That applies during initial climb after lift off as well as at any other phase of flight.