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Other mesh networks such as Eero and soon Luma support hard wiring your sattelites. I think its extremely important Netgear Orbi does the same. Especially for those of us who can.
An router could take care of that the mainr outer would handle all the ip addressing and the others set for access point mode would give the wired lan ports and wifi access points too. All you need is a lan cable from the main router too the access points if you can not run a lan cable you could use a power lan adaptors in placeof the lan cable.