This picture is taken from my garden.
As you can see it is quite close - above 50 meters away.
I did a lot of research before I bought this house last year.
From the research I concluded that the risk is very minimal, if at all.
Because of this I paid about RM 500 psf. Other places - about 100m away from my property is going for more than RM 1k psf.
I stay at Ampang Hilir. You will not find such a price in Ampang Hilir.
No regrets.
For all you know the HTC could have been underground and you would have no idea.