Happy to share an input, guys.
Yeah, bumpons, like most of 3M products, are amazing. Cheap solution for the leaning problem -- looks good and clean, too. I think the 14-piece pack costs only $2.50. I might buy a couple more packs for my Bat and Joker life-size busts. Found out while dusting them last week that the rubber pads underneath have already completely flattened!
Which size did you use? Looking at Amazon, there appears to be 7 different sizes.