Ya the reason most people put them under the sink is they want the ro
tap at the sink which u can still have just run 1/4 inch line there. Easy install too just attach a saddle valve to water line inside your house then run that line to cupboard or wall you have your ro
at, and then same thing for waste water run a 1/4 line to a sink drain and put a saddle valve there. Heres a pic of the saddle valve and 2x3 gallon tanks i have and the line coming out with a valve to fill 5 gallon bottles.