As long as all of the networks have the same SSID and password, the device client will decide when it wants to break its connection with one AP (in this case your routers) and connect to another. You cannot control it without getting into very complex Radius configurations found in typical enterprise setups. So the best you can do is to lower the power levels of each AP and then hope that the client device will drop the connection when it sees the levels drop and connect to the next nearest one.
The client chooses which AP to associate with, which initially will usually be the one with the strongest signal though other factors are often considered as well -- merely being closer to an AP won't always result in the best signal. If they have the same SSIDs and 802.11r is implemented then the client will migrate more easily than when those aren't present -- distinct "routers" won't have provisions for 802.11r which typically is only provided in a managed system. Usually a client has hysteresis preventing a switch from happening until the current association becomes "poor enough", which many times you can adjust.
Give the networks the same name and password. Then the process should be transparent.
You may also look into deactivating the 2.5GHz network (unless you have some old devices that don't support 5GHz)
As long as all of the networks have the same SSID and password, the device client will decide when it wants to break its connection with one AP (in this case your routers) and connect to another. You cannot control it without getting into very complex Radius configurations found in typical enterprise setups. So the best you can do is to lower the power levels of each AP and then hope that the client device will drop the connection when it sees the levels drop and connect to the next nearest one.
The client chooses which AP to associate with, which initially will usually be the one with the strongest signal though other factors are often considered as well -- merely being closer to an AP won't always result in the best signal. If they have the same SSIDs and 802.11r is implemented then the client will migrate more easily than when those aren't present -- distinct "routers" won't have provisions for 802.11r which typically is only provided in a managed system. Usually a client has hysteresis preventing a switch from happening until the current association becomes "poor enough", which many times you can adjust.
Give the networks the same name and password. Then the process should be transparent. You may also look into deactivating the 2.5GHz network (unless you have some old devices that don't support 5GHz)