Best solution to service 20-30 wireless laptops in 3 story building?

A new client has their office in a BIG old (circa 1800's) house, about 5000 Sq Ft. There are 3 floors with users spread about. They also move from floor to floor regularly. They are complaining that the wireless signal is weak in certain areas and that the network is often sluggish.

Currently they only have a Linksys E4200 wireless router serving all clients (no APs, Extenders). It is located at a remote 2nd Floor corner.

I've read good things about Ubiquiti Networks UniFi PRO Enterprise WiFi System (UAP-PRO-3). It has a 'hand-off' feature so that users can roam at will and always be connected to the strongest AP. Was thinking of spreading 3 of them around (1 on each floor) and using the POE feature to wire them to their gigabit switch via Cat5e.

Any other recommendations or 'been there, done that' experiences?

Points to best explained and detailed answer (ie, please don't just say 'Get a Sonicwall X or a Cisco X'). Ease of setup, use and range are important so please let me know why you recommend what you do.

Thanks!
Sal SoricePresidentAsked:
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smckeown777Commented:
Yes I've deployed Unifi solution plenty of times and it is a good system...

You don't need their 'hand off' feature since any wireless system will support roaming(as long as its setup correctly). Their hand off feature isn't simple to setup/troubleshoot but it isn't something you really need

Explanation of their ZH feature - https://community.ubnt.com/t5/UniFi-Frequently-Asked-Questions/UniFi-What-is-Zero-Handoff/ta-p/412719

With 1 AP per floor you should be good to go, long as its placed in a central position(or close to wherever the main group of clients will be located)

Their standard setup will enable roaming by default in any case so all good there as well
To setup the network you need to install their 'controller' software on a pc and you should be up and running quickly

Any questions just ask
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Sal SoricePresidentAuthor Commented:
smckeown777: Thanks for the help! I'll go with 3 of the Ubiquiti UniFi Pro APs...
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smckeown777Commented:
One small comment to add - the Pro's are the dual radio models(2.4GHz and 5GHz)
The UAP-LR models are the 'long range' ones - depending on your spread they might fit in better as they have a longer reach overall...

So it comes down to do you need the 5GHz radios for clients(yes nice to have in certain situations) but the LR's go that bit further and might be more beneficial overall...just something to think about ;)
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