I would like to make a video suggestion. @LTS_Tom if you have use case for HAProxy of pfsense + ACME. please make a tutorial guide. Thanks !
I have some done some testing with this and unless you have a DNS host that has an API you have to open up ports to the web server in the firewall which does not seem like a great idea. In my opinion it is better to just build and run the proxy behind the pfsense and have it handle that part.