Top Picture When considering a garbage disposal switch location - the sink mounted air switch is a favorite. It uses a standard sink hole or can be located on the countertop (hole required). It's safe, since the button is connected to the power source by an air hose and there is no need to install a new wall switch or under the sink switch if this is for a new installation. Power is still required under the sink for the disposal unit.
Middle Picture This kitchen sink has the works - Including water filter, garbage disposal air switch, pull out spray, soap dispenser. Make sure you order your sink with enough holes.
Bottom Picture Water filtration system, an Insta-Hot for near boiling water for tea / soup.