share buyback. how does it work?

I was wondering how the share buy back is actually going to work. My understanding is that OZL will buy back something like 28 million shares. How do they actually do this?

Do they set a "floor price" of say $14.50 and set their robots to buy any time the share is at or lower than this price until they have reached their target or twelve months is up?

Does the $14.50 become a floor price for all trades until OZL has completed the buy back?

Is OZL going to offer to buy shares directly from shareholders like they did last time, in one swoopl. If so when

I haven't seen any mention of the mechanics and am curious

Would someone please enlighten me