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Change the original router mode, place a router as the main router at the location of the hub box, and connect the network cables in other rooms to this router.
I really don't know how your home network cable is connected.
This general convenience line is to have a professional induction tool. If you have this sensing tool, it's easy for you to make a line. If not, it's relatively complicated. It's hard to get. You should ask a professional master to help you.
The refrigerator is not broken, and the wifi signal is not enough to break the refrigerator. However, if the refrigerator blocks the router, the signal is likely to be affected. The router should not be placed in the wall, the wall can be relaxed with a cat, and the router must be connected out.
When you renovated, you made this hub box smaller, and now it is not easy to change it, and then think of other ways.
There are only 6 network cables, all of which are marked with crystal heads. You'll want it later anyway.