I haven’t used any but have researched it some:
Minisforum DEG1 looks like the most polished option, but you’d have to add an m.2 to oculink adapter and cable.
ADT-Link makes a wide variety of kits as well with varying pcie gen and varying included equipment.

Black-out typically means it just doesn’t let any light into the room, not necessarily the actual color of the curtain

While I’ve heard mostly good stuff about Nothing, I noticed an interesting tidbit about early investors on Wikipedia:

raised $7 million from investors including Tony Fadell, Kevin Lin, Steve Huffman, and Casey Neistat.

Steve Huffman of Reddit fame, as a Lemmy denizen I’d say not ideal to be pouring more money in his pockets lol

Homebox has this capability too, you can generate QR codes for assets and scan it later to identify whatever’s inside.