This setup will work fine if it is configured properly. Unfortunately, everyone is a Sunday afternoon mechanic in IT these days and it is not something to be doing when you clearly have no idea.
Firstly, for this set up to work properly, the ones actings as wireless access points (WAPs) need to have different channels to each other, 1, 6 or 11. Ignore the channels in between. Similarly, the 5GHz need to be separate channels, 36, 40, 44 or 48. That way they don’t interfere with each other.
Secondly, the only way to keep them all up to date is to rotate which one gets to play router. The easiest way to do this is to export the configuration file for each one. As the configuration is locked to each router you will end up with three files for the three acting as WAPs and three more for the three actings as a router.
Next time an update appears, (and we must be due one, as the last, 43.01, is now four months old), you need to reconfigure one of the WAPs to act as the router and swap it for the present router. When that updates you need to reconfigure it back to the WAP setup and reconfigure the next WAP to act as the router. Put that on and let it update. Swap it out again reconfigure it back to the WAP and reconfigure the original hub to act as a router and put it back on again. I’d give it at least 24 hours between each rotation, as if you are on FTTC this amount of swapping around will screw with DLM and temporarily drop your connection speed.
While I agree with Licquorice’s point, I would also agree with TECHNO’s, complete Wi-Fi is going to be easier if you don’t understand what you are playing with.
Edit:
As far as the disconnecting goes, that’s one of the main differences between a mesh system, like Complete Wi-Fi, and what you are trying to do, which is known as Wireless Roaming.
The different channels ensure the wireless points do not interfere with each other. Your devices will lock on to whichever channel they see as strongest at the time they connect, irrespective of what the channel is or where the device is. However, if the thing he is playing Roblox on is mobile & he is moving around with it , it will keep dropping as it switches to the next strongest signal. With mesh systems you don’t get this dropping and reconnecting.
