Quest 2 only does wifi6 (2.4/5Ghz), not wifi6e (includes 6Ghz). The Quest 3 does support wifi6e 6Ghz though. Sorry but I’m not sure if there is much benefit going to 6Ghz with a Q3 unless you are in a very noisy 5Ghz environment.
I have a pretty standard wifi6 (not 6e) setup ethernet wired to my pc with a dedicated 5Ghz channel (ch36/80mhz in my case) I get very good wireless PCVR results with all wireless options (Air Link, VD, and Steam Link).