

DP has an option to transmit HDMI signals instead, this is what passive adapters use and will still have the same HDMI 2.0 issue. A DP source can be passively adapted to HDMI, but a HDMI source cannot be passively adapted to DP.
You can also get active HDMI adapters which actively convert the signal, and can work with HDMI 2.1. Intel actually has an active converter chip built into their ARC GPUs, and is how they get around this issue.








It doesn’t really matter how you setup dynamic DNS and SSL. I prefer to handle dynamic DNS on the router, incase it’s smart enough to refresh the IP after DHCP renews it. I do SSL on a seperate nginx instance, but I run a few other sites; it might be easier to configure it directly on home assistant, but I haven’t tried.
If you want some extra security, I’d look into mTLS, as that establishes some cert based authentication at the TLS layer before HTTP, but it can be complicated to configure.