> APU router is the most open-source network device you can buy. It comes with open-source BIOS, open-source operating system of your choice and open hardware schematics. It's not locked down in any way.

I bought mine with opnsense pre-installed and it has been absolutely rock solid. For wi-fi, I've just used an old router with wifi in "ap-mode" connected to my APU router -- interestingly it turns out that the throughput bandwidth for wi-fi increased by orders of magnitude as soon as the poor Asus box didn't have to perform any logic on the packets passing through.

[1]: https://teklager.se/en/products/routers/apu4d4-open-source-r... -- I have no affiliation with the company, just a happy customer.