The sash latch that you linked to is cheap and will not hold up well under heavy use. I know, I have two of them on our Bus. I needed a way to keep the emergency windows closed yet still be able to open them in an emergency. The weakness is in the pivot (like in all sash latches). The pivot will be subjected to stresses it was not intended for. They also take up a lot of room.
I know of a way to make a CHEAP latch to keep the cabinet doors shut. It will depend on your cabinets as to whether or not it will work for you. I'm not sure it will work on an insert door style and a 3/4 inset door is a PITA to use this method with (I hate the 3/4 inset doors on the Class C)....
Buy a small "loose pin" hinge (pack of 2). These hinges will let you remove the pin that holds the two halves of the hinge together. Buy a package of "bobby" hair pins You will be replacing the hinge pin with the bobby pins. Mount the hinge on the door and frame (opposite the door hinges on the handle side) so that when the door is closed the knuckle is exposed on the outside. How you mount them will depend on your cabinets. You may have to mount them folded together or open. What you need is the knuckle exposed to where you can slide the pin in. Using the bobby pin is cheap and if you loose it (and you will) you can easily replace it. I have also used short sections of copper wire as well as steel insulation wires (bent into an "L" shape). Steel rusts. If you use wire, use a metal file or sand paper to round the cut edges to prevent scratches. I have positive latches like I linked to in the Class C. They came with the RV. I also ended up putting hinges as locks on the doors/drawers. Mine are very old and are starting to fail. They are 30 yo after all. The springs inside the positive latches are loosing their spring.
What you are looking for is a "narrow loose pin hinge" or "narrow removable pin hinge". About 1-1/2 inches high. You will find them in the hardware section of Lowes/Home Depot (or even ACE or WalMart) in with the small zinc hinges and small mending plates. My computer is acting up and will not allow me to copy an image location so I can't post a picture except from photobucket.
This is how we locked out refrigerator door shut. The strap hinge is screwed into one of the screw holes for the reversible ref hinge. I used a cut down aluminum tent stake. Lock your refrigerator doors closed! TRUST ME! Mayonnaise is nasty to clean up. It's not a thing I want to repeat.