My particular mode has VGA, which worked well, but I now use DisplayPort on a 4K monitor. The com port (or serial port) is also optional. So watch out when you buy to see if those are included.
UEFI is available. I'm currently upgrading my machines to ArcaOS and UEFI. UEFI works, but you want to update the BIOS to the latest.
Uniaud works. The wired Ethernet works with MultiMac E1000B. There is no WiFi driver.
http://www.blondeguy.com/computer/garbopeep.htmlInteresting side benefit: even though this is a tiny computer, it has one SATA 2 1/2 inch bay for SSD or hard drive and one M.2 NVMe bay, so you can run both and have a lot of disk space.