While these are a great idea, that might be the worst place for it. There is a post over on iRV2 showing a totaled MH with Halon installed and the bottle never went off because there was never enough heat down low and this one started higher up. I talked to Mac the Fire Guy about this in Q and he said they never really figured out the point of failure but it wasnt in the normal place.
I have the same Halon only standing up but its on the opposite side from the burner and may have the same issue. After that fire post I installed a second one at the top of the fridge cavity.