Can't hurt to get your group all set up and linked as family and friends if you're thinking about it right now. You have two choices: you being the only one with an MDE and you being "parent" of everyone OR at least one adult in each sub-group has their own MDE that you link to each other. Then Play around with it a bit to see what the app has (wait times, dining info, fastpass area). But no, the only "deadline" by which you'll need it is in time to make your fastpass selections.
I used MDE to watch wait times for MONTHS leading up to our trip to help me pick FP+. I may have even made a spreadsheet, but that is just me. I am little crazy...
You can look at the ADR info any time. Fastpass you really can't look around until you have a ticket linked, because you just get a message about "valid park admission required". The FP interface has recently changed and I'm not sure whether any of the youtube videos that used to give a good overview have been updated to show new choices.
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