Little help from pros,about hardware choose

Unless you manage to find a used second hand device, OpenWrt compatible wifi 6 routers below 40 € are hardly offered in the German market. If Greece is the same, you will mostly be limited to 802.11ac (wifi 5) devices.

In general, I would suggest to look at four things to come to a decision:

  1. So you have 500Mbps-1Gbps fiber and need a router READ THIS FIRST

  2. the table of hardware

  3. what devices can be procured at your location

  4. once (2) and (3) are concluded, check out the device support thread in the forum