I need help with blocks in TD

How to put blocks like on this picture, I want to do a TD so does anyone know??

https://www.google.hr/search?q=gem+td+dota+2&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjZpfWPg6vZAhWIr6QKHWlpDUYQ_AUICigB&biw=1360&bih=662#imgrc=cxJu3Q2StEulFM:

also how to do when player want creat tower need space 2x2 block, not aoe circle like in a lot spells which are aoe...

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