Number 7 with the same information...
Do a WiFi design, do you have knowledge of this? You can do a simulation.
If not, get knowledge, do a training what ever.
You can read
this, step 1 and 2 are important for you, for now. You can also check
this.
During the older days you do a lot of site surveys. AP on a Stick, walking on site and check all locations. Today I don't do this in 90% of my customers.
Just doing Simulations, but you need knowledge for this.
Biggest problem on WiFi, it mostly works, also with very poor designs. But a good design gives you a better WiFi and saves money. Sometimes it saves a lot of money!
All answers before have right informations. But most important is, that you know what you do.
Do a "site survey" with the end device, great information, but bad to document.
Do a "site survey" with a tool like Ekahau or AirMagnet, great to document, but don't forget to compare it to you end device.
Do a "simulation" with a tool like Ekahau or AirMagnet, very flexible, but you need knowledge.
Use a vendor tool from the producer of the APs? I'm not a fan of this, mostly marketing/sell stuff, not technical stuff.
But based on your basically request, I'll recommend to search for a local WiFi dealer and request a simulation or site survey from this company. Maybe the best solution for you. If you get more request like this, do a
ECSE training. Perfect information for starters, a lot of CWNA stuff and not just Ekahau stuff.