There is a growing demand for invisible sockets on the countertop when designing a new kitchen. Enjoying the fabulous tiles and popular glass backsplash are the main aspect. They look much better if the unity is not broken by plugs, even if they harmonize in color.
Using sunken plugs into the countertop is a common solution. Its lid perfectly slicks to the countertop when not in use, and can be released with a single press, then just close it after using. The space for sinking, should be considered while creating the lower cabinet. It can be purchased with round and rectangular intersection, in several colors and with several number of plugs.
Sockets can be put on the bottom of the upper cabinets also. They will be invisible from the front. These can be even sunk into the cabinet in the case of custom made furniture, this way harmony will be more perfect.
There are much more possibilities in the case of a custom made kitchen cabinet. Plugs can be hidden in a drawer also, just like in many hotel bathrooms. The disadvantage: the drawer remains pulled out while the socket is in use, that can block our moving. More space saving solution is making a faux-drawer front which has to be fold down to reach the built-in sockets in the lower cabinet. The door will be looked as a part of the furniture while out of use. This is a good solution in the case of a kitchen island also.
Although corner socket is visible at the edge of the countertop and the wall, but at least it can be glued to its place without cutting the backsplash. It will partly slick to the sight choosing it in a proper color.
Ask for help of an interior designer for planning your kitchen.