Yes sure, You can use two Access Points for same LAN. two ways you can use these access points to your network.
Either attach Access Points with LAN cable directly to Wireless LAN port or
also you can attach one LAN cable from Wireless Router to Network Switch and you can attach your Access Points to your Network Switch.
Attaching to Network Switch would be more accurate and better way to perfom.
Yes, that will do just fine.
Yup, that's the way I've done it in the past.
Yes sure, You can use two Access Points for same LAN. two ways you can use these access points to your network.
Either attach Access Points with LAN cable directly to Wireless LAN port or also you can attach one LAN cable from Wireless Router to Network Switch and you can attach your Access Points to your Network Switch.
Attaching to Network Switch would be more accurate and better way to perfom.