The home position of Maslow is in the center, but you can move it anywhere using the “define home” button.
The scaling issue is a tough one. This thread has the details of the system which is working for me: MakerCAM Frustrations
The general things to look out for are what the units of the document are
-is everything 25 times to big/small? If so that’s an inches->mm issue)
-is everything just slightly too big/small? If so it’s probably a resolution issue in makerCAM