Where to power an aftermarket backup camera?

[bvz2000 1]

I have a 2013 TC. 

 

I purchased an always on backup camera system (I have no side or rear windows). Apparently the two power ports in the dash are always on, which I don’t want. The auxiliary port in the back appears to be off when the ignition is off. 
 

So could I wire the dash display unit to the fuse box #174 which powers that rear power point?

 

 Thanks.