Magic Lantern memory card doubt

[rawfa]

Hi guys,

I want to install Magic Lantern on my MarkII and while reading the FAQ section their website I´ve that "Magic Lantern runs from the card, as an add-on over standard firmware". So I have 2 doubts:
1 - Whenever I shoot an entire day (which will mean I will have to use different memory cards) I will need to have ML on ALL cards?
2 - I also have a NEX7 as a travel camera and it generates several folders on the memory cards. Can this somehow interfere on running ML if I use the same cards on both cameras?

[Pelican]

1. Yes.
2. No