I've got it running on my wordpress blog, but it's been so long since I set it up, that I don't remember exactly what I did to configure it. The guys on the Ruffle Discord can tell you what you need to do, I remember it was fairly straightforward, like one or two steps.
Now I just upload a .swf file, and then add some code like this to a page:
<p><script src="https://unpkg.com/@ruffle-rs/ruffle"></script></p>
<p align="center">[swf:https://kupogames.com/wp-content/uploads/EBF1.swf 700 400]</p>