Hey konjurer, welcome to the forum!
Folks have taken many different approaches to handling the side HDMI port. Personally I just left a gap in my case and connected a right-angle HDMI cable. We’re also working on a small solution for front panel mounted HDMI, which you can read all about here https://forum.sleepycircuits.com/t/hypno-hdmi-expander-diy/
Not sure when we’ll release the panels, but pretty soon hopefully.
There’s also the composite video output (RCA) on the front panel, which you can use as an alternative to HDMI, but in SD.
NDI, on the other hand, doesn’t work like a typical video output - you’ll need a computer to monitor Hypno’s NDI output. Check out our tutorial threads to see how you can set up NDI yourself
https://forum.sleepycircuits.com/t/ndi-obs-setup-troubleshooting-guide-for-mac/
https://forum.sleepycircuits.com/t/ndi-obs-setup-troubleshooting-guide-for-windows/