Our RV dealer acquired these hinges made by GRASS GmbH Movement Systems for us so they could install them in the cabinets over the microwave and refrigerator, but they say they can't because the cabinets do not have a wall for them to be mounted to. They say there is nothing for the hinge to grab onto. Has anybody installed these hinges that could offer some advice?

The door above the microwave needs a block of wood installed to the inside of the cabinet. I have the hinges for both but have not installed them yet. I will use glue and a couple screws as it will be attached to the panel board. I believe the one above the fridge will just install with screws

I would like to know where to find these. I used a gas shock for the cabinet above the microwave that I found at Camping world, but the shock and its rod are too long for the short door above the fridge.