Just 1 inch more than distance between prop and ground...
Can be more ...
Any angle would be good until the nose is horizontal or points up...
What you said actually means that “any angle is good as long as the nose is BELOW horizontal “
Perhaps you meant “as long as” instead of “until”!
Thinking in Hindi and posting in English often creates such confusion.
Your first suggestion is of course correct. But for a newcomer, it would have been clearer if you’d said:
“Legs should be long enough so that prop does not hit the ground when model is horizontal “