Ulrich 

https://www.marinaportoazzurro.eu/#

I don't have direct infos about Golfo di Mola 

No ferry to from Porto Azzurro to Piombino 

Esaom has two small marinas in PortoFerraio 

Can't find the mobile of Silvia Berardinello, manager of both places, but you can find the contacts on the web site. 

I'd rather recommend Esaom (1 or 2 depending on the draft) 

Another option could be the Porto Ferraio Marina located in the center of the town.

Let me know if I can help. 

Donato