https://www.blackcountrymetalworks.co.uk/wall-mounted-post-boxes.htm
Wall Mounted Post Boxes | Letter Boxes | Black Country Metalworks
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https://www.letterbox4you.co.uk/product/tocco-di-italia-modular-270-wall-mounted-post-boxes-for-flats/
Tocco Di Italia Modular 270 Wall Mounted Post Boxes for Flats Anodized Silver | Post Boxes For Sale
The Modular 270 communal letterbox is designed to be suitable for internal fitting, making them perfect for flats, apartments and offices.
wall mounted post boxes