Attaching stuff in the Keezer

Just about done with the build and I'm trying to hook things up. I have a 7CF Holiday and I'm trying to figure out where to attach my secondary regulators. I have a 3 body and I'm just not sure to attach it. I was thinking maybe the on the collar on the back side or on the side over the compressor hump, but, I'm worried about hitting a line or whatever. Any suggestions. If I do go into the side of the freezer, what size screws should I use?

 

I would go into the collar in the back.

 

Yeah screw into the collar, if you screw into the freezer you may very well be screwed! (pun intended)

When I build mine I'm going to put the bottle and regs outside with a hanging bracket.

 

I guess the back of the collar is the winner. Thanks for the input. Just can't wait to pull that first pint!