It might be possible to drill your current tower. If so, you'd need to put the second faucet lower than the first one. They won't fit at the same level.
The two faucet tower you linked to will fit fine. You may need to drill the small holes for screwing it down to the fridge, as they'll be slightly different. Not a big deal at all. I'd say installing that tower on your kegerator is a 15 minute job.