if i were you i'd pick 3 different spots instead of the one,
a) cuz its easier to hide less plants
b) if one plot is found you still hav 2 left,
c) one area may have a real dirt problem or may not get as much light,

picture this, you put all your plants in one spot, thinking they wont get found,
then half of them die by natural causes and then the others are found by neighbour hood kids and stolen, you'd be pissed rite?
well if they are in more than one place, its not a great worry if one of the patches has bad soil or is open to torrential rain and wind, as you will still have more, even if police find one, there will be more right? plus, the less your planting in one spot, the less they will be noticed,
this is just my advice, ignore me if u must, good luck anyway tho mate, hope you get a bountifull crop, - peace m8