placing them high up off the floor near the ceiling id going to be great providing that is where you are working wearing your anti gravity boots.
Sorry thermal dynamics 101 heat rises.
the other side of that coin is having them at floor level they are the most in the way objects in the world. Impossible to keep an area clean around them and if they are near any machine that generates swarf they act like huge chip collection repositories.
Ideally using long finned tubes placed about 3 ft off the floor and having a shelf over them works best
Using the cast iron radiators if they were mounted at about 8 ft high from the floor with a bright surfaced deflector behind and above them and smallish muffin type fans https://www.amazon.com/Achla-Designs.../dp/B001FXVJ1U
behind them or better yet under them forcing a low volume air flow up and around them, the deflector which would be behind and above , plus if louvers were horizontally mounted in front these would direct the air flow down and out.
Heated air almost needs to be moved by convection for best results but a gentle push greatly aids the areas to be covered. drawing the colder air upwards to the radiators will help a lot as well.
Anything that can be done to move the cold stagnant air near the floor to force it to be absorbed with the heated air also helps

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