A: Yup — this is definitely doable!

Due to how AppSumo's redemption process works, you'll need to redeem your 2nd code under a different email & then when you get into Heartbeat you can switch the account back to your first email.

Here's a quick guide that will walk you through this (with screenshots!):
https://help.heartbeat.chat/en/articles/6126037-purchasing-multiple-heartbeat-codes-on-appsumo-activating-them-under-the-same-email