I spray baste all my quilts with 505 spray. Used to pin, but am not going back.
I tape my backing down, layer the batting on top, smooth it all out, layer the quilt top on, smooth it all out, then peel back half of the quilt, spray, smooth it out then the other half, with both the batting and top layers.
Never have had a problem with any shifting or anything.
Oh, I do carefully check all the corners to make sure that they are sticking and respray that small portion if needed.
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My newest Grandson, Caleb Austin, was born May 29th. I am now Grandma to 4 precious babies. I am so blessed!!!!