There are several large manufacturers of HAM Radios. The largest are Yaesu, ICOM and Kenwood. Mounting options are plentiful. Mounting configurations sometimes depend upon the radio. Most handheld radios are used in marine or mobile environments. The majority have a rear belt clip or knob that inserts into a belt clip. The larger tabletop versions often have a detachable head. That head typically can be mounted while the radio itself is stowed out of site.
We find most handheld ICOM models use a rear belt clip. Our mounts use that belt clip to fasten to our mounting systems. Yaesu seems to use a combination of methods ranging from a mounting knob on the back to a belt clip and some have no rear clip at all. Mouting of heads often requires a different part such as the ICOM MB-63. You may need to drill some holes in the mounting plate to match a standard mounting pattern called AMPS (basic 4 hole rectangular design).
We offer a few pictures of HAM Radios mounted in a variety of configurations.
Belt clip suction mount from RAM
Rear button mount popular with Yaesu from MountGuys
Car Seat Bolt Mount for Yaesu FT-7800
MountGuys Blog 