@RandomTsar
So I think the position really depends on your army list and what your plan is with it.
A is interesting to me if I wanted to screen off heroes from long range stuff like OBR Crawlers, but I think it isnt good enough.
B seems like a pointless plan. The enemy could just ignore it and go for your objective. Otherwise you have to split your forces; You want to get his objective, defend your own AND defend the pyramid. As we talked about previously, the footprint is huge and the bonuses dont make you immortal, so you can very easily get caught. Also, why even put it there? What are you achieving?
C is probably a bit too far forward.
D is the kind of stuff I would do. Probably scoot it a bit forward and closer to the objective, meanwhile the entire pyramid blocks any deep striking from behind. This means you can defend the objective with bodies, meanwhile screening your pyramid.
From off the top of my head there is 12" from the middle line and down to your territory. So if you scoot up the pyramide to the white line and next to the green objective, you have roughly 22" (Kroak's CD) where the red line ends.
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On the flipside though, this is exactly the issue - If you place it in D, but lose the roll-off, you have planted a great garrisonable terrain for your opponent to drop his stuff inside. It wont even have to be long range artillery, it could be defensive casters etc., and they suddenly protect the objective rather well. It will automatically prevent any deep striking behind it, since there will be less than 9" too.
Due to the risk of the enemy getting it, I would be more inclined to put it somewhere like in position C - Its agressive if you get it, but if your opponent can get it, you can still place Kroak on the exactly opposite side in your territory and start nuking whatever is inside.
Another option could be to place it between B and D. It isnt right next to the objective, but it is close enough that you could defend it with a shooty/magical force, but if the enemy is a more melee heavy army and wins the roll-off, they would have to split their army up to defend both.