How do you know which note within a chord is the tenuto note?

Question

For piano (and I assume other instruments where one can play multiple notes at the same time as a chord, and one of said notes can be emphasized more than the others), sometimes there is a melody line that is played within chords, so tenuto marks are included to indicate that one note from each chord should be emphasized because it's part of the melody line. But how do you know/indicate which note within a chord should be tenuto-ed? The tenuto mark is always above or below the chord, but how does one indicate which note within, say, a 3- or 4-note chord should be emphasized? Do you just have to know, or is there a way to notate this?

There's a similar question here, but it doesn't address the question of tenuto use specifically.

Answer 1

You could write the chord with two voicings, by changing stem directions (and slight horizontal displacement when necessary):

---

EDIT
re: comment
I haven't seen this done with tenuto marks, but I have seen a similar thing done with staccato marks.
The following arrangement has complex voicings (and mixed articulation) for the right hand of harpsichord (the middle stave).

It's from "31 Pieces of the 16th-18th Centuries" - for descant recorder and piano (harpsichord), by Carl Dolmetsch:

Answer 2

I've seen both of these used. I prefer the second.