The C9's on wood are very nicely done.
Alas, I don't have a fascia board - the metal gutters (7" tall) connect to the rafters without a board at then rafter end.
I'm seeing that, yes, it would be possible to hang smart string nodes along the front of the gutters using those plastic clips designed for such purposes - in particular, letting the smart string nodes hang down can be OK (rather than needing to face them towards the street). The pix by jnealand show very close to what I was asking (except it's hung along wooden fascia with cup hooks).
However, it has a white (ish) background; my gutters are a reddish color to match the trim. I guess I'll trust that something will work and order smart string nodes and do some testing.
If I do feel a need to face the smart string nodes towards the street and audience, I suppose I could try mounting them to PVC pipe and then hanging the pipe from the plastic gutter clips. More work to set up and take down, so I guess I'll need to test whether it's worth it.