Most ping pong tables sold as outdoor tables are really indoor tables with a weather resistant coating, and they delaminate within a season or two of real exposure. A resin table is built for permanent outdoor placement, which changes how you use it. It becomes a fixture on the deck rather than something you set up for an afternoon.
Plan for a clear playing area of roughly 19 by 11 feet for comfortable recreational play, more if you want room for serious rallies. Choose a level spot out of the strongest wind, since crosswind ruins the game faster than anything else. A partially shaded location keeps the surface cooler and cuts glare during the middle of the day.
The table also works as a serving surface for parties, which is a genuine advantage on a deck where space is tight.