Here is a useful planning tool in Wireless Network provisioning for Cisco Meraki AP or the Mobility Express models.
This is an online tool called Cisco RF Wi-Fi Planner Tool. Check out https://rftool.cisco.com
You can use this by logging in to your Cisco Account.
You can put into account external factors in designing your wireless network such walls (brick, concrete etc), elevators, furnitures etc. You can also plan based on the estimated number of users and devices that will be on the area.
You can also get model recommendations and estimated costs.
And find the perfect location to install your APs using heatmaps.
User guide: https://drive.google.com/file/d/0B-jMTHE8ARyfbHl4NkQtWTJyUFU/view