Works this way, but you should run the CPE connecting to the leftmost AP in Client mode, not in Bridge mode (it's still working as a bridge or more precisely, as a relay station in RF terminology).

But note that latest CPE510 don't have a LAN1 port anymore. If you manage to get v1.1 hardware, they have a second LAN1 port and the setup is possible as shown in your picture.

With v2 hardware you can't use PoE Passthrough on the two CPEs connected by wire, so you will have to use a switch to connect AP2 and CL1 to the CPE.