I baste my quilts - regardless of size - on my cutting table. I start by centering the backing on the table and use the large, office binder clips and clip all around the edges. Next goes the batting and get that all centered. Use the same clips to hold that down. Finally the top with the same process.
Depending on the size of the quilt I will either thread or pin baste - usually pin. I start in the center and pin about a hand-width apart in all directions. Same if I thread baste - start in the center and about a hand-width apart. Once I have the center completed, I shift the whole sandwich to get to the next area and follow the same process.
It's tedious when doing a king size quilt as it needs to be shifted and re-clipped multiple times but it beats crawling around on a floor - if I had that much open floor space, which I do not.
Can't help you with the quilting part in your machine as I'm a hand quilter.