Fellow Mainer here👋
I would definitely move it. Not just for the direct sun now but especially later on when they're finishing up in the fall. When we start getting that cold and rainy weather in Late September into October it's going to provide the perfect breeding ground for mold. You'll want them to have as much direct sun and air circulation as possible. You may also want to think about throwing a couple clear corrugated roofing panels on top of that structure as well during the fall to prevent potential mold. I made a roof over mine last year with good results. Good luck!