I do not like that bracket. It has that cam ratchet with a strap that you got to get it right the first time otherwise it can be a problem to loosen it. I still has it on my FS MTB only because I seldom carry a Ulock on that bike anymore and I don't want to damage it if I try to remove it.

My other MTB has a mini and I use a standard holder but I also use a bungee cord holding the lock to the top tube.