Ground bus question

I am getting ready to purchase the Alpha Delta Ground Bus https://www.hamradio.com/detail.cfm?pid=H0-012783 for the outside wall where the coax meets the house. I plan to install their surge protectors and will have the whole setup tied into the house ground.

What is the best way to weatherproof the setup? I plan to tape the coax connectors, but surely there is a more permanent way to weatherproof this setup. The bar is almost 10" long, so I'm not sure a typical electric box will work and I will likely need the openings on the sides, not the bottom.

Thanks!