|Thanks for the help. |
I went and installed some cheaper Eero mesh units. ($180 for a 3 pack). They did not solve the problem. My router is about 80 feet from my weak spots which are outside the building. If the big door is open, I have decent wifi just outside the building. If I close the big metal clad door, the signal drops to nothing. Putting in the mesh network did not work.
Now I'm thinking of running cat 6 cable to the corners and seeing if that works.