I’ve found Linux compatibility is pretty good in generally as long as you’re not buying brand new. The carfuffle tends to be over distros that run an LTS Kernel so users need to wait for the next LTS for new hardware support, similarly a lot of people like their wireless drivers installed by default even if they’re proprietary, I think Kubuntu does this but not sure aboue KDENeon, they tend to be in repos either way.
The lists below may help along with your own research.
General
Some general links for sourcing FOSS compatible hardware.
Wireless
You want to pick your wireless device by it’s chipset.
If you need AC/AX/AD the driver will be proprietry so most distros will need to have it installed manually (usually in the repo). That’s not the case with Ubuntu/Kubuntu I think as they have them pre-installed.