We've done several similar-sounding warehouses at my company.
Please, get a site survey before you buy a single thing. Those hand scanners are finicky as heck normally, and your shelf contents can do a number on signal. You will save money in the long run by getting a survey and properly planning now.
Learn from my pain.
Also, double-check what the temperatures are like in the area where you want to hang these APs. We had a client have to send back indoor-rated APs and purchase outdoor-rated APs to handle the temperature extremes near their ceilings.