He Says 12miners.. I was thinking on a 12 mining Rigs
however it could go more than 1600w so probably you're right he refers to 12 GPU's.
12 GPU's still sufficient in a standard room and could be assembled in a single rig
I think same as you at first, lol. But then OP said " but I think my quantity is too small" for colocation, mean it isn't 12 rig. But may we need to ask OP to make it sure.
OP - You can start now, then when you got in trouble, come back here, we will always help you.