I helped installed AB Cu100 with VD150 fridge to a friend's h280 sometime ago. I mounted the compressor in starboard compartment beneath the seat just ahead of the galley sink/icebox. Cut a hole about 12" x12" for the vent louvers. It serves as in/out vent. Fridge works very well as the compressor is just next to icebox, the coolant lines are easily routed.
Have to fabricate a simple platform to sit the compressor on the level.