This is why I wish "southpaw" keyboards would become more mainstream. If you're right-handed, having the numpad on the left makes way more sense ergonomically.
My old keyboard was a cheap $30 membrane one, and it was a painted metal plate with a plastic shell on the back for the internals. The edge of it was rounded, but it was still just a single edge, maybe 5mm thick, so I used to give myself bruises trying to flick in FPS games. They were literally just a vertical line on my thumb.