Yeah, upgrade all but one. That way, all of them will get the sapper bonus even after upgrade, as long as they are near the original. Whatever you do DONT LET IT DIE!
This works better in theory than practice, however. Since Siege tower needs to be adjacent to city to provide the +50% bonus and it will die just anybody sneeze in its general direction from late medieval and onwards, in reality I find this is very hard to pull off effectively.
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