Comment 9 for bug 896264

Perhaps something like this:

[TechnoCreatorWH]
CreateObject=NACNST;Soviet Base
RetryTarget=yes
ForbidUnplaceable=no;If RetryTarget is set to yes, this one must be set to no.

The cell you fire this warhead at, if it doesnt have space for a NACNST(4x4 building)(automatic search for the building foundation instead of adding a tag for it), building wont be placed. If RetryTarget is set to yes, it will scan the next cell to see if its possible to place it there(and continue like that 50-100 times).
If ForbidUnplaceable was set to yes, and the cell you fired at had no space for a 4x4 building, it would not fire its weapon even if you forced it to.

Then, we can customize this even more

[TechnoCreatorWH]
IntroAnimation=TWLT100
CreateObject=HTNK ;Rhino Tank
RetryTarget=yes
ForbidUnplaceable=no

When the last frame of TWLT100 have elapsed, HTNK will be created.

Of course, this complicated to add, but the best way to make this bug free.