Q. Will downloading the IOS 11 profile give me all beta updates?
A. Yes, once downloaded, this profile will allow you to receive all beta versions OTA (i.e. IOS 11 beta 2,3,4,5,6 and then when its out, IOS 11.1 beta 1,2,3 etc...).
Q. Is it safe?
A. the method of downloading IOS 11 or any other beta profile is totally safe, its the version of IOS (or WatchOS) itself that could have potential security loopholes, especially in early betas.
Q. If I don't like it will I be able to downgrade?
A. Yes, although it does require a full device restore (see Downgrading for more information).
For any other question please feel free to contact us @IOS_Betas on Twitter