For quite some time, Fit-PC has been a fairly popular choice for higher end, small form factor hardware to use with VMS software. Fit-PC though did not offer surveillance specific models, just product options that could be used with surveillance.
Now, Fit-PC has released 2 models that are surveillance 'optimized' - one with built in 16 analog encoder for a 'hybrid DVR' and another with a built in 5 port PoE switch for 4 IP cameras.
Here's their marketing photo of the analog / hybrid DVR option:
Using pigtails like this gets messy fast.
I suspect the Fit-PoE has more potential. Starting price is $482 USD though typically with Fit-PC that's typically completely barebone / lowest hardware option.
Embedded PoE switches are clearly gaining ground (e.g., the Dahua/QSee kit), but the Fit-PoE is likely to cost as much as an entire kit that comes with VMS software and cameras.
I think there's a market but it strikes me as a higher end, niche one.