Adding trailer brake controller, mounting screw concern

(Vehicle: 2013 Tacoma 4.0L 4wd Sport ,Automatic)
I've decided to mount my Tekonsha brake controller to the right side of the steering column in the little curved cubby hold below the 4wd selector knob. It's a goofy location as there are no flat surfaces for ease, but I will get past that. My question is in regard to what is behind (above) the area that I am considering drilling into for some self tapping screws(red arrows)? I tried to see up there and feel around but I can't really get a good sense. Does anyone have any knowledge about that blind area? Thanks in advance, TJR

 

It’s empty back there aside from the 4wd selector switch harness.

 

Thanks. I don't plan to use screws any longer than necessary. Is the 4wd harness up and out of the way? I was thinking about trying to pop out the 4wd switch out to get a look into that area.

 

yes it routes behind the radio and over to the passenger side. The older trucks that pops out real easy but I think for your year you may have to remove part of the radio faceplate to get to it. Might not be a bad idea to have it out while drilling just to double check.