We foster the same age group. We have a crib, a toddler bed, bunk beds, and a twin bed, so far we've had to use them all.
The baby bed is in our room. Bunk beds in my son's room, and the twin bed in our daughter's room. We've had to do some rearranging depending on the age and sex of the child.
Good Luck...btw....we foster through the county.