I bought a cheapish wifi router to use for dedicated AirLink and I do SteamVR -> Quest 2. It works great. No latency (but I will admit the very occasional lag spike, it doesn't bother me and I don't miss a note while Beat Saber is going super fast, so it can't be that bad)
Yes, you do need a gaming PC. I got a gaming laptop for like $2400 AUD 3 years ago and it's going great with VR (and Starfield on Ultra, not in VR)
"The very occasional lag spike" completely destroys the ability to play Beat Saber. It'll drive you crazy (as it did me)!
...and I too tried dedicating my Ubiquiti UniFi 6 Wireless Long-Range Access Point (U6-LR-US) just for the headset to see if that would improve things (set it up with a new hotspot name so it'd be dedicated and only told the headset about it). The Wifi AP was on the wall just about 3 feet from my head and I still got the occasional lag spikes and I confirmed that they were due to the Wifi network (not just rendering spikes on my PC).
There's just too much random interference on the 2.4GHz and 5.8GHz bands for it to be buttery smooth. I suppose I could turn my house into a Faraday cage and that might improve things :)
Yes, you do need a gaming PC. I got a gaming laptop for like $2400 AUD 3 years ago and it's going great with VR (and Starfield on Ultra, not in VR)