Good news, I got it working. . . mostly. Found a setup guide that showed me what I was doing wrong.
Only have one small issue left.
I can't get Emby to work on SSL. I have a certificate setup, but, I get this error in my browser when going https. (http works fine.)
R_END_OF_FILE_ERROR
From searching the web, it is common for proxies to give this error, but I can't figure out what I need to change if haproxy to correct it.
Emby is using a letsenecrypt certificate, and is is running remote access through 443.
Any help would be appreciated.