for safety reason especially you already very late landing in HK, therefore you have to arrive HungKang border first (since border is 24 hr hours), [D\k^h
also LouHu border close at 12am, maybe very rush timing for you to pass AJF#Aw `o
5fd]v<
since you may not knowing any trust taxi driver , so you better stay over night in SZ then next day via train to GuangZhou Bei-Yun area