I have my router flashed with OpenWRT, and I would like to flash my mesh pods too.
At the moment I have a main mesh and 2 client pods(TP-link).
From the documentation it's not clear to me if I have to configure all mesh pods the same way or that I have to configure the client pods in a different way.
And if there is a main/client structure. Is it possible to have my router setup as main, even it doesn't have a wireless adapter?
A mesh network is a wireless network, so you cannot have a "mesh" without wireless.
Have you read this documentation?:
There is no such thing as a "main mesh", a "mesh pod" or a "client pod" from the OpenWrt point of view, those terms being proprietary to Tp-Link I guess.
The mesh component of the configuration must be identical on all meshnodes, ie the same radio channel, same mesh id, same encryption key.