Tp-link Er8411 Omada i have one it has thruput is in the 8.8 range . Its just the router you need access points for WiFi maybe a 10 gig switch with poe+ or ++ depending on which access points,

Try going to the manufacturers support website and downloading its newest firmware onto a computer and manually updating it. Id download it from my phones internet but you could use someone else’s network.

Just depends on how many wifi7 clients are on your network. I cant imagine in the next couple of years being able to actually use all that speed once it’s in internet land. I have a multi-gig setup and my wifi does WiFi 6 at a gig to the internet. I can hardly tell a difference 90% of the time from my VPN which is hobbled to 150Mb. The major government buildings and schools I design and set up WiFi for are mostly spec’d for 300Mbps and everything seems to work great from there. There are probably some gaming servers on the internet that let you connect at higher than gig speeds but they pay a premium for bandwidth . Playstation network without tricking it with proxies is about a 300Mbps connection± ping.