No you can combine the two, they work together. Just be careful, that if you plan on having 4 cards together that you have enough room below the last card in the system you are building to have an outlet coming out from under the bottom card. You will probably be ok with the MM case. I need to check some pics of them and get back to you.
The reason I mention it is because the EK blocks are amongst the thickest, you really need two slots between cards to use them because by the time you add fittings as well you can run out of space. But then again you might be fine. (going to check pics)
The reason I mention it is because the EK blocks are amongst the thickest, you really need two slots between cards to use them because by the time you add fittings as well you can run out of space. But then again you might be fine. (going to check pics)