I had insulation above my fridge space, but I remember it being the rolled kind. When I removed it, the space was mostly empty except for the very back where I assume the vent was. I placed a 1" thick piece of foam insulation on top of the fridge and used that as my base to construct my box for my wine rack. I still had plenty of depth for the rack.
2016 Roo 21SS
2005 Ford Excursion-Sherman
Mods so far:
PI hardwired EMC, Wire Shelving in wardrobe
Plexiglass screen door protector, Blue LED Wine nook
stairs, and counting...