My first time smoking with Masterbuilt electric smoker. I've read quite a few posts but couldn't find clear answers to my questions: 1. Do you have to soak the wood chips first? If so, how long. 2. Can I put in three slabs of brisket at the same time- one in each rack? 3. Do I multiply by the number of slabs the cooking time or is it the same for when you're doing only one? 4. Do I check the IT for each slab since they are in different layers of the smoker? Thanks. I appreciate any responses.