Greetings,
I’m wandering if I could use the Embed option in Google Sites to embed an rview 3D window.
rview has no help…
Where are the models stored? In the rview Cloud? How are they shared? Is there an embed link?
… so many questions. 
of the two i recommend https://3dviewer.net/
you can host the file in a web drive and open using the url
you can then share the view and even embed it
in the thread posted at the beginning of this reply you will find other suggestions as well
thanks @adel.albloushi
3Dviewer.net looks pretty solid