For what itโs worth, I use a single 7982 in my 6000 square foot homeโ3000 upstairs and 3000 downstairsโand coverage is great. My previous business-class Access Point (AP) had one or zero bars of coverage from my small wireless devices at the edges of the wireless cell. In comparison, it seems BeamFlex allows these same edges to have two bars or more (occasionally I see one bar, but in a second or two I usually see the result of BeamFlex and I have two bars) and this is with 5GHzโ2.4GHz coverage is even better.
I expect youโll get great results with the AP. I am familiar with many wireless vendorsโmost notably Cisco and Arubaโand, when it comes to a wireless signal from a simple contained little box, Ruckus appears to do it best. That said, your mileage might vary. My home has a fairly open concept and more walls and whatnot might reduce your signal coverage. Right outside of my home the signal is expectedly and notably weaker, but itโs still better than what I had before.
As for your attic, I donโt know if the heat up there is a great idea or not, but I can say itโll reduce your wireless coverage. Ideally the AP should be as close to your wireless clients as possible, with little to no obstructions or interference near it, and the best place for this would be on a ceiling facing down. If the AP is a bit closer to the pool, you might get better coverage out there and 2.4GHz will pass through walls better than 5GHz.
Overall I am pleased with my Ruckus investment for home use. Hope this helps.