I strayed upon this post because I really would like to use a wireless connection for PC gaming on the Quest 2 but i've got a few technical issues.
The main one is that i'm using Unifi network equipment which doesn't support Wifi6. On top of that the gaming PC is also quite some distance from the nearest access point so the connection is hardly lightning fast.
I was contemplating getting a Wifi6 router like the TPLink AX1500 and then just connect it directly to the PC using an ethernet cable. However, as the router wouldn't also be connected to the internet I have no idea if it would work. Effectively the Wifi6 connection would only be used for sending the data to/from the headset and the existing wifi connection on the PC would be used for anything else (such as authenticating into Steam so I can launch locally installed games).
Would this sort of setup work? Getting a cable from where the gaming PC is to either of the routers in the house is problematic to say the least.
(I have a BT connection which gives me < 10mbps but is tied to a Sky TV package. We also have Virgin Media at 300mbps but the previous owners of the house had the installation terminate in an upstairs bedroom for some weird reason).
First of all, don't get the TP Link, they are problematic with the Quest 2. Also, you don't need Wifi 6 for the Quest 2 if you are using it as a dedicated router for the Quest 2.
But, you are on the right track, a dedicated router will give you a better VR experience than using the main home router. Any decent AC/AX router will work. IF you want a recommendation, the Asus AX55 is pretty good. But if you have a budget, a cheaper Asus AC router will be just as good.
As for running a cable, have you tried powerline adapters? If laying a network cable is impossible these are your next best option.
The only thing I am not sure of is how the wireless connection on your PC will work with the Quest 2 in that scenario. I haven't tried that myself, but have read people say that it's great and people say it's terrible.