Right now I've got my amp and pedals on top of my cab where the stuff gets dusty. I'm not gigging right now. I've got a small Kustom KXB500 class D amp that can be rack mounted. I'd like to purchase a rack tuner (Behringer BTR2000) and compressor (Alesis 3632) in the future. Right now I use pedals for that. The only pedal I will keep in the rig is gonna be my OD. So I just go and get a 3HE rack right? Does there need to be space in between the units?