My wife and I will be spending three months in Melbourne, Florida, again this year, starting in January. Last year we were there for three months also and tried to find a cat boarding facility. Only ...
Are you looking to board them the entire time or just for certain times during the three months?
I can't help for specifics in that area, but my family did cat boarding. New clients usually came by reference from one of the local dog boarding kennels. You might call some of them and ask if they know of anyone.
If you can, you might also talk to the kennels and/or vets to see if any of their staff does petsitting at your home (not sure if that will work in this situation).