Shall I give a template to the rec-letter writer?
Asking for a template letter is bad practice, albeit probably not uncommon in some countries.

Generally speaking, I'd avoid volunteering any template, and if the professor asks for one, think carefully whether you really want a letter from them.

When you ask for the recommendation letter, just include your CV, possibly a transcript of your exams, and then ask the professor if they need further information. This may be similar to your point 2, but avoids suggesting a narrative. 

You don't specify your field, but I think the above is sufficiently broadly expected in STEM fields (in my experience, even those who ask for a template, frequently recognize that it's bad practice). Therefore, I definitely disagree with the author of the linked HBR article. 

Points of view similar to mine, if not even stronger, can be found elsewhere on this site. See for example:

This very detailed answer from Pete L. Clark

This comment from JeffE