I believe if the certificate is accepted by Tableau Server, the domain, and IIS then you shouldn't have an issue. I would try it out and let us know. Tableau Support would be able to confirm the expected behavior for you.
Diego, I opened up a case and Brandyn from Tableau support called me. He said when my users interact with the embed code on my IIS web site, the embed code refers them to the URL for the Tableau Server. If the Tableau Server is hidden from direct Internet access, then I would need a reverse proxy to allow users to get to it.
I told him that the documentation is unclear on this topic. He will talk to the documentation folks to make this more obvious.
Thanks for your help.