Normally put in back of house where washing and drying yard would be. Cover it by reclaiming the backyard to shield it from the elements.

Inlet is standard 3/4" quarter turn bib for washing machine available at hardware stores.

For outlet, hack the wall and floor to install a 1.5" pipe no higher than 3" that drains out to the outside or connect to a small floor drain (needed for washing floors) that connects either to a manhole or outside the back drain. The vertical part of pipe exposed out of the wall must be 45° and should stick out 2". The 3" height allows flexibility of using top or front load. Top load prevalently cannot drain higher than 4" and rarely depending on models, 6". Front load usually is minimum 14" (40cm) but the pipes can be supported through the holder braces at the back of the washer to maintain that height.

Or buy an Ikea sink as a laundry sink. These comes with Atlant sink drain pipes which has two spigot for washing machine/ dishwasher waste. The cabinetry should make a hole for outlet pipe access to connect to the spigot. Note that going this route only allows for front load washers unless a dedicated drain pipe is installed as described above.