I reckon that should also work, e.g. with an 8 or 16 port switch, you could connect other wired devices such as spare room ports, PCs, etc. in addition to the secondary nodes.
Then main important point is that this switch connects to the LAN port of the primary node and that its WAN port (with the globe icon) connects to the Internet such as an ISP router, like below:
Then main important point is that this switch connects to the LAN port of the primary node and that its WAN port (with the globe icon) connects to the Internet such as an ISP router, like below: