As a PCB mount lover I keep a look out for them, sadly there are not a whole lot of them.
Cherry G80 series are generally PCB mount except for a few models. There are also many rebranded Cherry like Peacock, Schneider, Nixdorf, Highscreen, Scitex, Olivetti, Commodore, Amiga, Compaq, APC, etc, though usually there are only certain times where they had some G80 as a high end option so most of them are not.
Vortex Poker, Pure, Race.
Plum 96 and Neo Zelia.
WEY EK and HK series, though they are not useable without the hard to find proprietary KVM box that is required.
Alcatel MMK, some of which have a proprietary connection and protocol to be used with their thin terminals.
GH60 can be if you build it as such.