[Zephyr]

I know it may be a little early looking in to this, but I have some major brumation Q's I'd prefer to ask now so I won't be panicking at the last minute.
This year, most if not all of my snakes will be brumated. I won't be doing the minimum; all will be brumated for around 6 months.
My questions start here:
1. I have multiple species that seem to require the same temps. Can I do group brumating?
2. Is 45 Fahrenheit a good temp for brumating?
3. I read once that people brumated other snakes, even tropical ones, and very low temperatures. My ribbon snake is obviously used to higher temps, should she be brumated at 45 with the rest of them?
4. Is a 5 degree drop every week a good way to adjust the temps? Same with bringing them out of brumation.