The only suction cup mount I've seen fall off is the dual. Never flown with anyone who had a single that fell off.. The single is more than adequate, at least it has been from my year and a half. Just have to make sure you put it on correctly. Dual is way too big. Try ripping a single off. You can't do it. You can literally hang from it if you wanted. The only issue is when cabin pressure changes...the suction pressure changes. If you don't put it on tight enough initially it can be an issue. But having two mounts without enough pressure Bc they weren't put on tight enough won't help much.