There is a fellow below with 3 kids and grandparents visiting, I'm with him - a single AP can't handle the traffic, certainly not in a high RF area. I've wired as much as I can in.
I use an 8-port head switch to break off IP-TV & internet onto seperate VLAN's, an older quad-WAN router for routing/firewall/VPN/etc, and a 16 port switch which serves as the main hub for everything. There is a powerline network on a dedicated plug next to the powerbox, with cat6 cable runs off to a pair of branch 8-port switches which are now both full. There is another 5 port switch further down the line as well. I have 4 access points - 1xAC87U, 2xAC68U, and an older AC66U which covers a little dead spot in the library and give a few more ethernet sockets - all wired in, to cover the house with wifi.
For servers, I'm using an older PE2950 with 15 drives running FreeNAS and Plex. I have a newer 1U C1100 running ProxMox ~ for Active Directory, DNSMASQ, Squid, NTP, Zoneminder, Observium etc. I had an extensive setup for caching and ad-filtering from being on a slow and unstable satellite connection, now though on FTTH it's probably a bit overkill but all the same, no extra work to leave it running. It's all on a 1500VA 4U UPS. These are both wired in with bonded connections.
To keep the connection low-latency, high speed, and always available, I had to start wiring things in and move to a dedicated router and additional AP's. For reference, one AP held up to about 15 devices, by 25 on wireless streaming video started to drop-out, now I'm looking at roughly 60 devices (excluding networking gear) - so the more on wired, the better, not just for my network but for my neighbors as well.
The servers ... I had the opportunity to buy a rack worth of equipment complete with some software licenses out of a data center for little more than the cost of picking it up, so had to make use of some of it. Makes the basement a bit noisy though.