Normally, one would perform a 'AP on a stick' (APoS) site survey first, which requires a special prepared measurement AP on a tripod/pole and walkaround doing measurements using site survey software (such as "Ekahau" or "Airmagnet")... but, this cost a lot of time, skilled people and money.
So... if you would like to avoid it... you could simply install 'one AP in each room'... resulting in ~12 APs per floor. There are some restrictions to this approach: Each AP must not interfere with each other, so: 1) limit the radio power to minimum (so it will only cover that room and-a-little-more) 2) use a smart configuration on both to use different channel on each AP. (So they won't interfere). 3) enable as much as channels as you can (i.e. use 20 MHz width on 5GHz - not more!)
Depending on your building (perhaps you should share the building layout) - it will look like something like this (please see picture).
If you stick to these rules, then it can hardly go wrong...
1) minimum radio power!
2) smart channel planning (please see picture)
3) slim channel width (20 MHz, so not 40 MHz, not 80 MHz)
I'd use those Huawei AP2050DN "hotelroom" AP models for it.
Hope this example is useful and inspires you?
AhXing

