Question about Synology DS224+

WLAN is not possible on the DS. It has 2x RJ-45 1GbE LAN connections.
DLAN or a WLAN repeater with LAN connection (e.g. Fritz Repeater 2400 or similar) may be a solution. However, a direct LAN connection is certainly more stable and faster.

Since DSM, WLAN is no longer supported, but you could, for example, connect a LAN cable to a Fritz repeater and then integrate it into the WLAN...?