I do not have a longarm machine and am only comfortable quilting smallish quilts on my DM.
I just found this video which offers me an alternative. I am making a large quilt and am going to try this methosd. She quilts each block, top and batting only, then sews them together and lays the top on the backing and does minimal quilting. I'm not making this clear but the video will clear up any questions.
I like this woman and her ideas are right up my alley. Hope you like her too. (Not affiliated in any way)
https://www.youtube.com/watch?v=l8kyurCw8-g