Wekmor, not 100% sure about that, I may be able to try something later.
Anyways, I did the same thing in my creative world however I used a stack of 9 boilers. (only 8 active using 56, 40, 36, 32, 28, 24, 16, 7 mirrors going from top to bottom). The 9th boiler on the bottom was to connect to an infinite water source (which provides the bottom layer of 7-8 mirrors that you don't see in Tompy97's screenshot)
I had lead wire going from the Solar Turbine at the top of the boiler stack going down and out through the ground (which had me remove a mirror) to an Energy Bridge. One test was to output MJ which it generated ~115 MJ/t using the Charge that was produced. Another test was to output EU using multiple MV Producing Energy Bridges. This generated ~880 EU/t.
That said, using the steam generated in other objects to produce MJ or EU might not be the greatest idea in terms of maximizing your gains.
Knowing now that i can output the steam and store it however, will make a huge difference in some new testing I'm doing today.
@Tompy97: You might want to use a Charge Meter on your boilers to see how much power each is receiving (1 mirror = 1 power). Mirrors will face a boiler as long as there is not a block between it and the boiler and is within range, however they will not produce any power if it has a block above it.
If the Liquiducts are causing some mirrors to not generate power, I'm sure a Liquid Tesseract / Ender Tank / etc would solve that by allowing you to output the liquid without going over the mirrors.