The IRAs are as follows:
1) Roth#1 established in 2014
2) Roth#2 established in 2015
3) Roth#3 established in 2015 (yes, 2 estd. in 2015)
4) Roth#4 established in 2016
5) Roth#5 established in 2017
6) SEP IRA from self employment
7) Traditional IRA with a basis
8) Rollover IRA from an old 401K
All Roths, #1-#5 are from Roth Conversions.
I don't expect to withdraw from these IRAs until past 59.5
Qns:
Q#1. Can I consolidate #5, #4, #3, and #2 into Roth #1?
Q#2. Is there any barrier to consolidate all Roths at the same time ? (I read conflicting info on a limit of a SINGLE Roth-Roth rollover allowed in any 12 month period)
Q#3. Can/should I rollover #7 & #8 into #6? (I understand that SEP IRAs have certain better protection against creditors)
Q#4. Is there any value in keeping #7 separate, for computation re. the basis in the future, maybe used for future Roth conversions
Any other advice?

Thanks