I have 3 WTIU’s but I used a router and connected all of the WTIU’s with ethernet cables. This eliminates the WPS issues . I do have to run in super TIU mode. What is interesting is when I power everything up and wait a couple minutes for the blue lights not all of the WTIU’s are read. Sometimes I have to refresh a couple of times to get the app to see all of the WTIU’s.
Rich R