Which one?
Ok, so like a TP-Link TL-WR802N.
So, then the options are open for you, how do you want skin the cat…
ESP based - Using a small SOC board with an ESP chip, either ESP8266 or ESP32, usually just needs 5V through a USB-C or Micro port, all has Wifi for communication, or some option for Ethernet port. Look at this topic for some options which you can buy from OLX.
The other option is with RTL SDR (RTL is short for Realtek, the manufacturer of the mainly used chip in the device, SDR stands for software defined radio), it basically a radio receiver with software programable frequency settings and decoding. https://www.rtl-sdr.com/
You can use it to receive the W-MBUS (Wireless MBUS (Meter-Bus - Wikipedia)) messages from the meter and decode those with the WMBUSMETERS program.
Regarding ESPHome, you need to check out this, if you don’t know what it is. https://esphome.io/
Maybe the best option for you would be this one: Magic Reader ETH - czytnik liczników wody, gazu, prądu itp. HA ESPHome Gliwice Zatorze • OLX.pl
As you have ethernet next to the meter, and power as well, so you would basically read the meter from next to it, and transfer the data to Home Assistant on the ethernet cable. No issues with wifi or reading the wmbus messages from a distance.