Deco Mesh Networking questions

1. Is it not possible to use my preexisting router to do the routing and have all 3 deco satellites run as Access points running in mesh? >>> Correct, not possible. The Archer is not TP mesh compatible, as far as I can tell.
Something else to consider. The Archer is a dual band router. The Deco is technically a triband... but good luck getting 6e to work as wireless backhaul because 6e reach is 15 feet, maybe. And if your environment is brick etc, the Deco purchase will never be able to use 6e as wireless backhaul, so effectively you'll have another dual band router. The ideal routers currently, in my opinion, are the triband units with one 2.4 and two 5Ghz bands. 6e is incredibly fast and efficient, but reach is poor by design\power table.

2. I know that one of the 3 deco satellites will have to be used as a main router (by my ISPs modem). My questions is the 2 remaining deco satellites extend off of one another in the same direction? To help visualize this, I'm asking if all satellites need to be in range of the primary deco that is acting as the router by my modem?
>>> Yes, I believe you can wirelessly daisy chain the two child nodes off the one parent node. Child two does not need to be in range of Parent, but Child two does need to be in range of Child one. And Child one needs to be in range of Parent. Setup all nodes in the same room of modem. It may tell you they are too close during setup, disregard the message and continue with setup. After they are setup, unplug both child nodes. Then relocate the first child node where you want it. Remember, these child nodes are wireless clients too, so if they are too far away from each other, they too will have high RSSI problems, and not connect to their upstream node in the daisy chain. Once you place the first Child node, wait for it to completely boot up, then turn off wifi on your phone used to setup. Then, while your standing next to Child one, turn wifi back on to ensure you're connecting to Child one. Run a 3rd party speedtest Oookla whatever, and see if Child one is providing acceptable speeds. Keep in mind, url and app based speedtests measure speed behind your wifi client (your phone,) so if Child one is too far away from Parent, and your phone is connected to Child one, your connectivity may work, but you speed may be impacted big time, especially since the Deco 5Ghz band will be doing two duties; providing backhaul communication between the parent\child nodes, and providing bandwidth for other wireless clients in the house, so again simply because you're using a dual band router (Deco), this can impact wireless mesh performance, regardless of distance between the nodes. If you're satisfied with speedtest result on phone while connected to Child one, then relocate Child two to the desired location. Then rinse and repeat; wait for Child two to boot up completely, disable wifi on your phone and turn it back on (to ensure you're still not physically connected to Child one.) Then run speedtest again and monitor results. If any of the speedtests don't provide adequate speeds, move the nodes closer to their upstream node.

Also, once you setup the Deco as a wireless mesh network, you might be able to use one of the Powerline to connect one child node as a wired AP directly to the Parent, and mesh functionality will still exist. This might allow you to extend one of the Child nodes far from the Parent. But, it may be too far to communicate wirelessly with the other Child node, so 'mesh roaming' may not work at all.
I'm not recommending you do this with both child nodes because the Powerlines may step on each other and may break Mesh or child nodes connectivity entirely.

Some things to consider:

I live in an old house so i cannot route ethernet cable through the walls and running ethernet outside the walls is not an option for aesthetic reasons (i don't care but people i live with do).

I live in a country where walls are brick/concrete with rods in them so each of these satellites will cover a much smaller range. Hence the question if they can extend off of one another without having them all be in range of the main deco.

I'm currently using powerline adapters but its not as efficient and the quality degrades after 100 meters.
>>> Are you providing internet to the entire community? 300 feet? What's going on here?

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