I'm putting mine in a metal box mounted to the back side of the collar, sticking up enough to see the display. In doing that, I am only going to put one 1/2 inch hole through the collar to route wiring and temp sensor through. Inside the fermemter, I'm Im mounting one sureface mount 2 gang, that will give me two always on, and two heating outlets. I plan to use the always on for circulating fan and for stirplate power, and the heat ones for homemade fermwraps. I'll post a picture when I get it together.