Apparently you skipped over this part. The camera has to see the entire laser workspace to be useful in Lightburn. The Galvo head is high up from the work area. I am surprised you did not consider this because the camera would be right down on the part if mounted on a S30 laser module.
Your statement…
…confuses me. Why would you want a mounting for the S30 when you have an xTool machine? And if you have a Sculpfun S30 machine, which version? Any mount proposed would depend on this detail.
I suspect you will you will have get ingenious and create your own mount if you still want to do this. Sometimes, a little effort on your part is required.