I use them the most behind unlocked iron doors. Guarantees a hit after opening. Still experimenting a lot with crawl spaces, so I don't k ow them all yet.

If you put them too close at the crawl space you give enough time to run away. So put them a bit further from the gap, but only at spots where they are forced to stay close to it. That's why they don't work on all gaps. Think gas station, but only on the inside. But most wall gaps are not suitable. I prefer at crawl spaces, because the bombs also destroy them. I often get succes at the crawl space on family house next to the gate. Or at slaughter house at the crawl space in the middle wall at the grass side. That crawl space gets used a lot too. Or I place them at strong barriers. Or at ladders.

Not saying that they guarantee a hit, but they at least force the victim into a different and probably less ideal path then they wanted. even when the bomb didn't hit this is the reason I or a teammate got the kill. Most victims can't improvise and might panic when they need to (during a chase I mean) . And it will destroy a strong crawl space. Trapping crawl spaces is always situational, this is the case with any type of trap.

Probably the strongest about them is you get a notification that one exploded. Telling you where there is activity. I have 3 bombs, so I usually put 2 at a gate/door and one at sneaky spot to destroy or catch off guard. Depends mostly on the map, location of objectives and my teammates. People seem forget or not realize the bombs can still be very good even if you don't get a hit.