I use a a cheap set of foldable saw horses and a foam insulation 4x8 board. Menards, Home Depot etc has the materials. I just set it up in the garage when needed and when finished fold up the horses and stand the board on its edge against the wall. Very light weight and doesn't need much room.
I don't make quilt sandwiches larger than the 48" width so these are fine for my use. I use 505 to spray and then lightly pin them to help secure.