No atmosphere means very little thermal radiation is pulled from radiators.
I imagine the best bet would be to drill into the surface of the moon and sink your radiators into the ground, fill the gaps with a material that transfers heat well.
Easiest version of that would probably be to lay the radiators on or just below the surface and bury them in a regolith concrete mixture of some sort. Probably not as efficient as drilling straight in, but way less complicated I imagine.
Just once I’d love to see a major government force a company into bankruptcy by making them clean up their own mess.
Company: “We can’t clean up our industrial mining waste, it’s too expensive and we would go under!”
Government:
okay well we will have the taxpayers pay for it. Here have a bailout. Remember, daddy loves you so much“Oh then I guess you should have factored that into your costs. Get to work. And when you have no more money to pay for others to clean it up for you, we expect to see the executives and management out there with gloves and a can-do attitude”