This is a mounting plate for the Rak Wizblock 19007 with the Ethernet Module. I'm using this for a Meshtastic node in my attic.
It was designed specifically for the Universal Project Enclosure with Transparent Cover 5.9×3.9×2.8 inch(150×100×70mm) found here:
https://www.amazon.com/dp/B09CMJQ921?ref=ppx_yo2ov_dt_b_product_details&th=1
It will probably work for many enclosures of similar size, or you can remix to suit your needs.
Happy Printing