First photo compares the two mounts--top is quick disconnect and the lower with belt clip. The quick disconnect when all assembled and using molle clips to attach to one of my battle belts puts the holster about 1 5/8 inches from my body (back of belt). The belt clip setup puts the holster about 5/8 inch from my body (back of clip).
Second photo is of two battle belts with left one using belt clip and right one molle plus quick disconnect mount. I will probably use the quick disconnect setup on my right side (can swap in pistol) and use belt clip to add radios anywhere else on the belt.
I tried the molle clips plus quick disconnect (blade tech) on one of my chest packs and the radio sagged away from my chest enough to get in the way. I can't really use molle clips alone on my chest pack because the radios would be vertical (antenna up nose). With quick disconnect system you can change the angle to point antennas off to the side but the stand off distance was too great. If I was wearing something stiff like a plate carrier (if you see me wearing a plate carrier then none of us should be there!) then it would probably work but I would much prefer radios on side of plate carrier cumber bun area as is usual case.
The zero9 kydex holster design (channels for mounting screws moulded in) will always prevent mounting radio tight to the body the way a fabric/leather case with belt loop or built in clip can. If you are accustomed to standoff from carrying a duty weapon and other gear then you will be at home with zero9. My battle belts keep everything solid to my body and nothing bounces if I run (If you see me running then you should run too....) or move in and out of vehicles. As poster above mentioned about friction retention, I don't strap in radio when working command post or other highly civilized area so I can quickly snatch out radio and sit it on desk etc. In rougher conditions I tie down radios and when stationary/seated for long periods I just remove my battle belt (takes 2 seconds to remove, maybe 6 to attach because of aligning battle belt to inner belt going through my belt loops) and hang is over chair or something.