On one of our days we will start at Hollywood Studios and use our 3rd FP+ by 1pm. Plan to head back to the hotel (Yacht Club) afterwards, take a break, then hit the Magic Kingdom at 6 p.m. Can we (try to) book our 4th FP+ for a ride (e.g., Seven Dwarfs Mine Train) in the MK at a kiosk in HS or do we need to wait until we get back to the YC or even the MK itself?