Including at least one birdbath in your garden helps to ensure frequent visits from your feathered friends. You may even get lucky enough to see one or two species that don't have an interest in taking advantage of your bird feeders.
Incorporating more than one birdbath into your space is a great idea if you live in an area with lots of different kinds of birds. Some species aren't especially social and prefer to keep to themselves.
It goes without saying that you should choose a level spot in a safe area - especially if you're using a birdbath constructed out of lighter materials. Birds won't use a bath that they can't see. The perfect location is one that's visible to birds and to birdwatchers alike. However, keep in mind that if the bathing facility is totally exposed, some birds might not use it. They have a tendency to get nervous when they drink or bathe.
It's up to you whether you want to put the birdbath in the sun or in the shade. If you live in a cooler climate, you might want to place it in the sunniest spot available. This helps to keep the water warmer. On the other hand, if you live someplace hot, placing the birdbath in the shade helps to keep the water cooler and slow down the growth of bacteria.
It's not recommended that you position a birdbath under a fruit tree or any other tree that sheds blooms or nuts. In addition, it should be far enough away from bird feeders to avoid stray seeds from finding their way into the water.
While it's certainly ok to put a birdbath in the middle of a flower bed, take into consideration the delicacy of the surrounding plants before doing so. Bird feces changes the acidity level of the soil. Delicate plants may not live through the change.
Change the water frequently. Birds won't play or bathe in dirty water. The closer you put your birdbath to a water source, the easier it will be to maintain, and the more the birds will appreciate your efforts.