If it doesn't do it when turning its drop links as turning the wheel will take up any slag. If it still does it when turning then anti roll bar bushing or sub frame. If you push the car down at the wings and you can't replicate the noise it won't be top mounts. If it's just making the noise on one side it could also be ball joint or wish bone bushing. You'd expert the alignment to be slightly out if it's either of these, so that's a good indicator. Drop links can go quite quickly if not installed correctly or are shite quality ones. I've seen them go in less than 5000 miles in rare cases