Hello,
yes, there are 3 ways to achieve transparent bridge.
You can create WDS bridge, mesh or relayd configuration.
I would suggest mesh option, it might be easier.
RUTX10-1: set DHCP server (default on), set IP (192.168.1.1 default), create AP (default on), create mesh link similar like this (dont forget to set interface “lan”, this will bridge mesh link to your network):
RUTX10-2: disable DHCP, set lan IP (192.168.1.2), create mesh with same options like first one
RUTX10-3: same as RUTX10-2, just different IP (192.168.1.3)
This setup will create L2 bridge with wireless links and you should be able to reach your PLCs from your PC all will be in (192.168.1.1/24) network, also you can change IPs as you need.
This should work If I understood your requirements correctly.