Connect all the APs via Ethernet cables to a central switch, each AP on a port.

Connect the switch to the router via back-to-back Ethernet cable using one port only.

Assign default gateway ip address on the router port connected to switch, say 192.168.1.1/24.

Disable DHCP and/or NAT (if avaialable) on all APs.

Configure ip addresses on APS (if mandatory), E.g. 192.168.1.2-5/24 for 4 APs. You can use those IPs for managing the APs.

Run DHCP from the router (unless you have another DHCP Server), e.g. 192.168.1.10-50/24.

This will create a single network segment for all hosts connected to the APs (or Switch in general), and the default gateway will be the router.

Hosts on this segement will now talk to each other directly via the switch.

You can use same SSID for all APs if you need, and you can use non-overlapping channels to minimize interference.

This is a basic setup, there are other possibilities, depending on requirements.

Connect all the APs via Ethernet cables to a central switch, each AP on a port.

Connect the switch to the router via back-to-back Ethernet cable using one port only.

Assign default gateway ip address on the router port connected to switch, say 192.168.1.1/24.

Disable DHCP and/or NAT (if avaialable) on all APs.

Configure ip addresses on APS (if mandatory), E.g. 192.168.1.2-5/24 for 4 APs. You can use those IPs for managing the APs.

Run DHCP from the router (unless you have another DHCP Server), e.g. 192.168.1.10-50/24.

This will create a single network segment for all hosts connected to the APs (or Switch in general), and the default gateway will be the router.

Hosts on this segment will now talk to each other directly via the switch.

You can use same SSID for all APs, and you can set each to a different channel (1, 6 or 11) to minimize interference.

This is a basic setup, there are other possibilities, depending on requirements.