Hi and welcome to WSGF :)
No, they will not run at 3x1680x1050 at 60Hz. 57Hz is the highest refresh rate you can use in that res.
If your monitors will not run at 57Hz, I believe you will have to use 3x1440x900 at 60Hz.
Sometimes you can get 57Hz with some work, even if at first it doesn't appear it will work. I never tried it though and I'm running 4320x900 at 60Hz. Sorry I don't know the details for trying to force 57Hz, but there are some post explaining how to do it. However, it is not a certain. It may not work with all monitors.
Have you checked the sticky thread for Known working monitors at 57Hz?
If your models are listed as working, that means that someone has them and tried it and they work at 57Hz. If they are on the Not working list, you may be out of luck.
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