It’s hard to imagine a more minimal, low-profile, offset light mount than the new PLM (Proctor Light Mount). This stainless steel mount is so low profile that the top of it’s rail interface sits flush with the top of the rail it is mounted on. You can actually fold your iron sights over the top of it.
It is designed specifically for use with the Streamlight Protac 1L but will also work with the Protac 2L and Surefire E-Series lights.
Check out the PLM at Way of the Gun.