Embedded SRE

As we all know, every company implements SRE differently and while some focus on a centralized team, others will have "embedded" SRE's. While i've seen some experimentation with the concept, I don't have first hand experience with a solid implementation IRL.

I'm curious to hear how these types of positions are handled at various companies.

Do the embedded SRE's report back to an SRE manager or do they report to the manager of the team in which they are embedding? What kinds of interactions do the embedded SRE's have with the centralized team (if there is one)? Do they typically stay in one team, or rotate? Is there formal expectation of what type of work they'll do on the team or are they just another engineer with a specialty? Were the embedded SRE's on call or any other general SRE responsibilities? Do the engineers continue to work as SRE's or do the lines get blurred into them just becoming another resource on the team?

Any other things that you think worked well nor not well with the approaches you've seen?

Thanks in advance!