I have used baggie feeders in Indiana in the middle of winter as fumidal B
feed when a hive has developed nosema.  I have also used them as emergency
feeders.  I use a dental pick to poke small holes in the baggie on one side
only.  I increased the number if needed.  I have found 5-6 holes is usually
enough and have not had problems with the bags emptying too fast.
 
I just put them on top on the hive bars or on top of the inner cover.  I
really prefer the top hive bars.  Of course you can change the configuration
by changing the size of the baggie.  I prefer the freezer type bags because
they are thicker.
 
The system worked well for me.
 
Apiarist
AKA:  Bill Nelson
North Liberty, IN. USA