Generally all devices need to be connected through the "main router", whether it's the modem or not.
I want to disable the router here as I dont want to run wifi from the closet
The "router" doesn't run wifi though.
It's the "wireless" part of a wireless router that runs wifi – the "router" part instead handles ...
Added routers in this setup need to be connected to the ISP modem/router. This assumes you wish devices like one printer to service all rooms.
If you do this, you would need to experiment with where to place a wireless router. You need to get an Ethernet cable from the closet to outside the closet if you wish wireless to be outside the closet.
If you wish to ...