It seems there are 2 ways to fix these to the blocks,one is to use adhesive and the other is to fix a metal grid and the slips then click into this and you just point the joints.
I’ve never fitted brick slips but I would be tempted to use adhesive & some suitable spacers as with tiles. The metal grid idea will guarantee uniform gaps but it sounds like it might be time consuming to fit & could add to the cost significantly; I can imaging that pointing all the gaps is going to be a nightmare!
Some builder merchants only sell the slim brick only where you have to render the wall then bedded them on, the galvanised mesh type you may have to order it for delivery, I don't know what area you are in but some here that will supply to the diy'er
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