I used this on my rotary table by through drilling the existing holes and bolting it from the top to the table. Works perfectly. Had to remove a little bit of material to clean up the edges of the jaws but that is pretty common with these inexpensive chucks. Happy with my purchase.
In my opinion product and price ratio is really good, you get what you paid for though (chuck is not German or Swiss top quality, but for home users it's ok). As the chuck is so cheap you need to do some chamfering and cleaning yourself.
I bought the 10 inch and its good runout is good one piece body the only iffy is the plastic cover on the back for the ring gear cover but it seals good with the plastic so maybe not a fault ?
Gary W. Sumner 
