Better AP for my home

Question

Hello,
I ask you for advice on which is the best AP for my home. My house is 10mtx10mt, on 2 floors. The AP would be placed in the center of the ground floor, at the top, almost at the edge of the ceiling.
About 40 wireless devices will be connected to the AP.

Another question:
why  the R510 cost equal than the R310?R510https://www.amazon.it/Ruckus-wireless-Zoneflex-R510-Dual-802-11/dp/B072PRC9C1/ref=asc_df_B072PRC9C1/?tag=googshopit-21&linkCode=df0&hvadid=279793429868&hvpos=1o1&hvnetw=g&hvrand=4064175732640556680&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1008743&hvtargid=pla-568385708570&psc=1R310https://www.amazon.it/Wireless-ZoneFlex-Interno-Supporto-Ethernet/dp/B01GOAWQRO/ref=sr_1_fkmr0_1?__mk_it_IT=%C3%85M%C3%85%C5%BD%C3%95%C3%91&keywords=Ruckus+R320&qid=1556100658&s=electronics&sr=1-1-fkmr0

michael_brado · Answer

Yes, I wasn't clear. Ruckus sells product thru authorized/trained Resellers, but not online stores like eBay/Amazon.
We certainly replace any faulty unit that leaves the factory, once. People who request replacements, must return the faulty units (or destroy them). If anyone "resells" a device that we have already replaced (serial number), we do not replace it again.  (...and would suggest that person contact whomever "resold" the already replaced device to them!)

It doesn't happen a lot, but it does happen...  thanks.

unknown · Answer

good answer... :)
the first thing that comes to mind for me is: how does a seller not authorized to sell your products? Does he come to steal them at night? lol
If a product has left your factory and it has a problem, you fix it, this is what serious companies do.

40 devices, including: mobile phones, tablets, PCs and home automation devices (sonoff, shelly, etc)

michael_brado · Answer

Out of curiosity, how many different type of clients are there in the 40 devices that use wireless in your house?