I understand that you want to be safe and use open source firmware for your router. Open source firmware can offer more features, security, and customization than the default firmware that comes with most routers. However, not all routers are compatible with open source firmware, so you need to choose carefully.

According to my web search, some of the best routers that support open source firmware and have at least Wifi 6 are:

- **Turris Omnia 2 GB open source & WiFi router**: This router has a powerful processor, 2 GB of RAM, 8 GB of flash storage, and supports Wifi 6. It comes with its own open source operating system called Turris OS, which is based on OpenWrt. You can also install other open source firmware such as DD-WRT or Tomato on this router.
- **NETGEAR Nighthawk X4S Smart WiFi Router**: This router has a dual-core processor, 256 MB of RAM, 128 MB of flash storage, and supports Wifi 6. It also has four external antennas, four Gigabit Ethernet ports, and two USB 3.0 ports. You can install DD-WRT or OpenWrt on this router to enhance its functionality and security.
- **Zyxel Armor Z2 AC2600 MU-MIMO Wireless Router**: This router has a quad-core processor, 512 MB of RAM, 4 GB of flash storage, and supports Wifi 6. It also has four external antennas, four Gigabit Ethernet ports, and two USB 3.0 ports. You can install OpenWrt on this router to customize its settings and features.
- **Linksys WRT3200ACM Dual-Band Open Source Router**: This router has a dual-core processor, 512 MB of RAM, 256 MB of flash storage, and supports Wifi 5. It also has four external antennas, four Gigabit Ethernet ports, one USB 3.0 port, and one eSATA/USB 2.0 port. It comes with Linksys Smart Wi-Fi software, but you can also install OpenWrt or DD-WRT on this router to access more options and controls.
- **GL.iNet GL-AR750S-Ext**: This router has a dual-core processor, 128 MB of RAM, 16 MB of flash storage, and supports Wifi 5. It also has three external antennas, three Gigabit Ethernet ports, one USB 2.0 port, and one microSD card slot. It comes with pre-installed OpenWrt firmware that allows you to use VPN services, Tor network, DNS encryption, and more.

These are some of the best routers that support open source firmware and have at least Wifi 6 according to my web search. However, you should always check the compatibility and specifications of the routers before buying them or installing any firmware on them.
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