The muscadine and scuppernong can both be easily trained to grow horizontally. I don't know about them coming back though I would guess that they will. If you left any growth on them at all, they surely will come back.They naturally go dormant in late fall, so you won't know whether they will come back until the spring. Muscadines/Scuppernong grow and produce best in full sun. They will certainly produce in dappled shade, just not as well. They both make wonderful jellies. Ken