If you’re going to put your fountain outside, you’ll usually have more area to work with but be sure it’ll fit in your garden or on your porch, patio, or deck. Tabletop fixtures are often smaller, but the surface must be big enough so that it does not slip off. Mounted fountains take up no floor or counter space, but you must have an open wall that is strong enough to support them. Also, since most contemporary fountains are electric, make sure you have a conveniently accessible outlet.