Yes, I read the thread and found an opinion about installing Tone in the PC expansion slot
However, I use the low profile PC expansion cards, its height is 10 cm, and the height of the low profile plug is 8 cm. The Tone board fits well. But in a thin case, you need to drill a hole for the USB-C port of the Ton board - Dremel 3000 will help here
HTPC platform is based on intel 365 socket and i3-9100f processor without video core. HDMI video card nvidia 1030 is responsible for 4K video and 5.1 sound output. Khadas Tone is responsible for 2.0 stereo sound output. Windows 10 installs Emby, Spotify, Apple Music clients - Kodi 19 media core.
This is the initial layout in an empty box