Theological reflection shaped by scripture is more important. There are many baptismal traditions within the Christian faith. The Anabaptist or baptist movement stressed the importance of adult or believer baptism by immersions. When you accept Christ, then you're baptized. It is contingent upon your profession of faith.
Baptisms take place beside streams, in rivers, lakes, oceans, in backyard pools, even indoors.
In many churches the baptismal pool would be right where we have our organ pipes or behind the pulpit. With curtains pushed aside, the pool would be there for all to see. In the Eastern Orthodox communions, infants are baptized by immersion, almost to the point of drowning. They come up gasping for air. The Orthodox want it to be traumatic.