Chastity device reviews discussion

So I am pretty small when flaccid but I grow to a good 8 inches erect and I have been struggling to find a cage that I dont slip out of when flaccid, when flaccid I am about an inch and half.

So I wondered if anyone had advice or suggestions on a metal cage that I cant just slip out of that is easy for my Domme to put on and take off and has room to grow a little as She would like me to be locked more often and for longer periods.