Take the bags OUT and put them on the floor! If the owners are at the back, they will not see you, and the bag will have to be put 'underneath' and they will be pissed. In my pre-elite days, those people were abouut the most annoying on board.
Space in the overhead wasn’t usually a problem until the airlines started charging for checked bags.
The airlines decided to inconvenience all of their customers for maybe $2000 extra revenue on the flight.
Airlines are pretty close to being the most dysfunctional industry there is.