Installing a basement sump pump is absolutely necessary if you live in an area that's prone to flooding, or if your house was built in such a way that the foundation is below the level of the water table. Putting in a new sump pump can be a difficult job, so you want to get it right the first time by choosing the best place for the pump. Here are some general guidelines to follow.
Next to a Wall
You might think a centralized location would be the best spot for a basement sump pump, but you'll actually want to place it next to a wall. You'll need to install piping to pump the water out of the house, at least 3 or 4 yards away, and centralizing your sump pump will only create the need for more pipe. The water will drain fine with your sump pump near a wall.
Not Too Close
You don't want to install basement sump pump too close to a wall. You'll be drilling a hole through the floor to place the basin, possibly with a jackhammer if you're digging through concrete. Drill the hole about a foot away from a wall, in order to avoid cracking your home's foundation.