Summary

working up electronics for my boat and realized that I needed a holder for my 30 amp connectors from my external socket to my inverter. I am using these male/female plugs but any circular diameter of around 45mm can be used in this holder https://www.amazon.com/gp/product/B07LH71M5C/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8

the mounting holes are 5mm and can accept a size 8 wood screw

feel free to modify as I created this on the fly for my requirements and it works really well so wanted to share

-- Update 1 --
added a version with a stopper hook so it will hold the plug if mounted upright