We worked to spread the items out so that it wouldn't be overwhelming.One thing you can do with that is draw attention with something static, and then have the action prop startle them from the side or from under cover.
I have seen yards that have so much going on it reminds me of a amusement park or carnival noise wise. I know a lot of people really like this kind of stuff but I am 'old school" and like the power of the imagination. (which seems to be diminishing rapidly with some of today's kids) I usually have a few air props but this year I had none.. I had some people that were disappointed as nothing jumped at them , some were even more leery due to not knowing what to expect.Can you have too manny feature props or anamatronics? I sometimes wonder if to many things going off takes away for each other. Next year I may find better sensors or make a better way of timing them (rather then built in motion/sound sensors )