Indeed, provided the assembly is UL listed for the purpose, there are no Code issues involved. The applicable passages are 210.52(C)(5) (emphasis mine):
(5) Receptacle Outlet Location. Receptacle outlets shall
be located on or above, but not more than 500 mm (20 in.)
above, the countertop. Receptacle outlet assemblies listed
for the application shall be permitted to be installed in
countertops. Receptacle outlets rendered not readily accessible by appliances fastened in place, appliance garages,
sinks, or rangetops as covered in 210.52(C)(1), Exception,
or appliances occupying dedicated space shall not be considered as these required outlets.
(E) Receptacles in Countertops and Similar Work Surfaces. Receptacles, unless listed as receptacle assemblies
for countertop applications, shall not be installed in a
face-up position in countertops or similar work surfaces.
Where receptacle assemblies for countertop applications
are required to provide ground-fault circuit-interrupter protection for personnel in accordance with 210.8, such assemblies shall be permitted to be listed as GFCI receptacle
assemblies for countertop applications.
Unfortunately, the T&B KPR-15G is on "permanent engineering hold", don't ask me why -- otherwise, it seems to be the finest example out there of such an assembly. If you don't mind the difference in appearance, though, you can use the Lew PUFP series (they pop out at a "sideways angle" vs the vertical pop-up on the T&B and Mockett units, as shown in this PDF). Unfortunately, the image in the question depicts the Mockett version of this concept, which is sigh listed as a portable power tap, and thus not Code-compliant in this application.