Boot up from external device and watch it wipe non-windows boot entries (yes, even with secure boot off) and then not automatically find any other EFI files so you have to navigate to them manually. Oh, and the only way to add them back is efibootmgr tool, or if you want GUI, Bootice in Hiren's boot (yes that's still a thing).
At least that was experience with HP 255 G7.
As for another one, a mini PC, the UEFI setup seems to have limited HID driver support. Basic cheap keyboard seems to be a must. DO NOT DISABLE SECURE BOOT IF JUST THE MOUSE WORKS!!!!! Upon reboot, it will ask you to confirm disabling secure boot by TYPING in something. Every time. Even if you reset UEFI with the motherboard pins.
At least that was experience with HP ProDesk 400 G3 mini.
But hey, I also had issues with Dell, I think Optiplex 7020. It was unable to boot via internal DVD drive. I tried 2 of them, both fared the same, no problem reading and burning discs in OS. I tried a USB DVD drive, that magically worked. What?