Many of the Dell/HP mini PCs with Intel i5 or higher are vPro, because they were used in corporate environments, but it looks like this is rarely part of the eBay item description. Thanks for checking.

vPro devices support Intel TXT (DRTM) to verify firmware integrity on each boot, based on user/OS policy. TXT can be used with QubesOS ("Anti Evil Maid"), Windows Virtualization-Based Security (VBS) or upcoming Linux Secure Launch in mainline Linux. vPro also supports optional remote KVM/serial management over LAN with Intel AMT, which could be considered a feature or anti-feature, depending on use case.