Towers vary widely. I guess 2-3 is a good number, occasionally more, more often less. Although in the end game it's not uncommon for me to have several more (5-6?) depending on what I've drawn and who owns the Vikings.
I think the average for Bequeathing is a little more than once per player. I've seen two more often than zero. Rarely more than that, but I haven't played that many games.
Great, that's good info. I don't need exact numbers, more just an idea of what would be within the realms of reasonable. I don't want the AI to spam Towers well beyond what a human would likely do. It can probably get away with fewwer than 5-6 Towers, as it is likely the owner of the Vikings, though it's not a guarantee.