What siblings said, and also some (mostly older) refrigerators have radiators on the back and depend on air convection to cool them. But the insulated container

What siblings said, and also some (mostly older) refrigerators have radiators on the back and depend on air convection to cool them. But the insulated container itself, including the cooling circuit, is OK to lay sideways. Long story short, you can do it, but you need to reconfigure some pipes. Also, the question is not dumb at all.