Your link is not working for me.
One like this
https://a.co/d/03p6uRbH
They come in several varieties, some run only on 12v, some come with a separate adapter that plugs into the wall & supply 12v & some plug unto the wall with an internal adapter. Pick the one that will work best for you.
In my setup, I have a single converter that supplies 15v for all of my B6 chargers (8 of them). If one charger goes bad, and they occasionally do, I just swap it out.
I buy the cheapest ones I can find, usually from aliexpres. I always keep a spare on hand. That way the long shipping time is no big deal, I'm only replacing my inventory of spares.