Junction box in cabinet - how to mount?
Go ahead with the (usually plastic) extension ring so the junction box cover can fit right on the back of the cabinet. You may need to use two rings to fill the space between the cabinet back and the junction box rim.
Actually it's your preference whether to put the box cover on the wall itself and just have a hole in the back of the cabinet.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.