In a word: Points 
Most dessiccant boxes and spool centre holders have enough clearance to avoid that. Despite that, I have two that are a bit tight. But they generate far less dust than the Bambu spool rims, so not much of an issue imo. As for the beads themselfes, if the centre spool holders are stuffed, they have little chance to move. I did generate some dust from them when I overheated them in the microwave though But do not put PETG containers in the microwave. They’d look different afterwards 
I look forward to your view in 2 months time 
Things can indeed go wrong terribly (such as bending a hot end due to missed poop chute congestion), but they tend to be solveable and, in my experience, are much rarer than with pre-Bambu printers. I frequently do 24-96h plates, but I do have a fire alarm above the printer of course just in case.
I have both of mine to the left of the X1 which minimizes PTFE length for the main one. There are a number of AMS stacking stands on MakerWorld. I use this AMS stacking stand for P1P and X1 by MihaiDesigns - MakerWorld but am not 100% happy with it as theres an obstruction preventing fully free sliding of the lower AMS.