Don’t know of any.
You’d have to get a 10G switch and a 10Gbps BaseStation
Be ready to spend money.
Ubiquiti has some of the best prices and their 10G (XG) switches run about $600, while their 10G (XG) AP/BaseStation run $800-$1500 depending on which one you get... and even then that’s mainly for 802.11AC use. You’ll also need a router/firewall to go with that, as well as some way to run the Unifi Client.
So yeah.
What exactly are you trying to do? Do you just want to support 10G on your wired LAN, or do you actually want all the various frequencies supported by WiFi6, or are you just after WiFi throughput?
And to answer your question from above, if you have a 10G NIC connected to a 1G NIC, the connection will auto-negotiate down to 1G. Both ends need to be support 10G in order to negotiate at that speed.
You’re limited by whatever the slowest end is.
Also be aware that some devices that are 10G may not be capable of negotiating down to 5G or 2.5G speeds (which are showing up on some higher end desktop motherboards), because they are not really that common. 1G/10G is common.... 1/2.5/5/10 (and various combinations of those) are not that common.
I have a few SFP+ MMF modules and DAC’s that can do 1G/10G... but not 2.5G or 5G (AFAIK).