Having suffered a mishap on two slides and a double on the third slide, we now perform a visual inspection at all potential points of interference before we open the slides, including tops (pushed a fallen smoke detector through the top seal on the bedroom slide).
I have added magnetic catches behind each drawer. It's a belt and suspenders thing. We also give each drawer a good thump to seat them before we bring in the slides. Having said all this I'll likely crunch a drawer (I've already done two) in the not too distant future.

