I am currently using SpamSieve on trial mode. I am trying to decide on the best set up for my situation. I installed it on my laptop which is my main computer. I use Apple Mail client, and have several email accounts. I use Mail on the laptop, a desktop, iPhone, and iPad. All are synced via iCloud. They are IMAP accounts (there is one old POP account on the desktop which is just getting junk now, but I don’t sync it to the other devices, and it has no option for IMAP.) My laptop is running most of the time, but about twice a year there are periods of about 10 days each when I don’t have it with me. Then I use my phone/iPad for Mail. So regarding your section 3.14 “SpamSieve and Multiple Macs”, is it better to go with option 1 of running SpamSieve on one Mac and letting it clean for all Macs, or to go with option 2 of the drone setup.
Also, I am leaning towards having my Spam mailbox on the server rather than locally. I know that takes up space on the server, but since I will delete the spam periodically anyway, does this really matter?