That looks like a switching power supply.
This forum may not be a good place place to ask for your local code requirements.
Just make sure that you fuse it, looks like it may have one built in.
It says water proof, that is a bit of BS, Unless it is in a epoxy resin, or similar.
It is best to check with your local code, and they may not even be able to answer.
A metal Bud box would be safe, for when it smokes, but may not meet code.