A mesh Wi-Fi system uses multiple coordinated access points to provide one managed wireless network across a larger area. The word “mesh” describes how the system coordinates nodes; it does not mean every placement automatically gives full speed.
Backhaul matters
Nodes need a path back toward the main router/gateway. That backhaul can be wireless, wired Ethernet, or—in some products—another medium. A node receiving a weak wireless signal has limited capacity to pass onward, even if your phone shows strong signal to the node itself.
Place nodes where they can still hear each other well
Do not put a satellite in the dead zone you are trying to fix. Place it between the main node and the weak area so the backhaul remains healthy.
Roaming is client-assisted
Mesh systems can encourage clients to move between access points, but phones/laptops still participate in roaming decisions. A sticky client can remain connected to a distant node longer than expected.
Wired backhaul
Ethernet between nodes removes wireless backhaul contention and is often the best option where cabling already exists. It can make a modest mesh kit perform more consistently than an expensive wireless-only layout in a difficult building.
Backhaul is the hidden link
A satellite can provide strong local signal while having a weak upstream wireless backhaul. Place nodes where they still receive a good connection to the main system; Ethernet backhaul can remove that radio bottleneck.
Roaming is client-assisted
Mesh systems can advertise information and steering assistance, but the client ultimately decides when to roam. Sticky clients can remain on a distant node until signal drops.
Router versus AP mode
Mesh in router mode owns DHCP/NAT; in AP mode an upstream router does. This changes default gateway and management-address expectations.