I always put knives, blades down. I read a news article about a child who did impale themselves falling onto a knife. I won't needlessly endanger my grandsons lives. They love to help load and empty the dishwasher (long may it last)
I put sharp knives in the dishwasher with blades up. I started doing this after having to replace a cutlery basket (surprisingly expensive) when it was damaged by having sharp things dropped into it. My children are convinced I will fall and impale myself - and as I get older I reluctantly agree that I need to be more careful. But if I comply how do I protect the basket?