You can fire those off at close range too, but only once.
The real issues rise though with the back blast, you need ample space behind you. And hope you're not standing behind the RPG gunner when it fires.
Do not do strange things in the toilets of other people's houses without their permission.I fear that using a rocket launcher at short range is suicide. Please, use them correctly at long distance.It could have an effect on your afterlife.