On most newer RV fridges, you will find warning labels advising CAUTION against piercing the outer insulation layer. This includes the sides of the fridge!!
When properly installed, you will find ample opportunities to secure the fridge on the front top/bottom retention holes with screws of proper length to hit and hold in the wool. Also, add 2-3 screws to the bottom plate at the rear of the fridge and there is virtually no way that the fridge will move from its' cabinet.
OTOH, if the cabinet is not properly constructed with the correct dimensions and proportions for the rear baffle space....you WILL have problems. Just follow the installation manual that comes with every new RV fridge.
Lew Farber...RVIA Certified Master Tech...ABYC Certified Master Marine Electrician
SOLAR TECH ENERGY SYSTEMS, INC.
AM SOLAR ...MAGNUM…VICTRON ENERGY...LITHIUM & LIFELINE BATTERIES…MARINE REFRIGERATION