Power cleans

Only recently finding out power cleans are an "essential lift" and the reasoning makes sense - developing "explosive" or sudden, high power muscle movements. I'd like to develop my sprint power/technique, so this is appealing.

However, I really doubt my gym would be ok with me doing power cleans in a rack spot, which are the only barbell spots in the gym. Additionally, it looks scary; I've injured myself working out before and it's a major concern because it will kill my consistency, which will also kill my motivation (I'm actually just starting to consistently workout again after I injured myself the last time, a whole year afterwards).

So what are good alternatives? Anyone have good experiences with these alternatives? I've heard db squat jumps aren't too bad, anyone use these in their routine?