P2p access point connection

Hi folks. Advice please for a good connection.

1)We have a basic modem/router that provides internet
2) I want to wired connect a cpe510 (transmitter)
3) wireless connect a second cpe510 (receiver)
4) wire connect a tp-link c20 to the receiver (access point)

is it recommended the transmitter cpe510 (wds access point) be on the same subnet (dumb access point) or should it act as router on a different subnet ?

The same question for the c20. Is it recommended to be dumb access point (lan) or router (wan) ?

Thanks