For example, for The Walking Dead S06E01 there are 6 available Dutch subtitles:
https://www.opensubtitles.org/en/search ... id-4211958
4 of those are uploaded by Sub Translators. I cannot imagine all of them are synched badly...
Instead of paying(!) someone to get subtitles synchronized, just make sure you are using the subtitles matching the video file. For example use
https://www.opensubtitles.org/en/subtit ... e-again-nl with The.Walking.Dead.S06E01.720p.HDTV.x264-FLEET
If you cannot find subs matching your video, then find a video matching the subs - that's the idea behind "Release name".