If you have chosen a supplier for the IP67 Power Supply, could you share their name or website with us?
For DIY builders we recommend grabbing a PSU from Meanwell. They are a reliable brand with a huge range of products that suit many applications. Make sure to look at their IP67 rated lines, and get a 12V constant voltage PSU of the current that you’ll need for your build. They have many distributors including Digikey, OnlineComponents, and Mouser if you’re in the US.