Multiband (MB) excitation of spiral cine DENSE MRI has the potential to provide three-slice coverage in single breathhold with 2D displacement encoding. To acquire three slices in one breathhold of 14 heartbeats, we develop MB3+ phase modulation, and use golden-angle rotation, outer volume suppression and variable flip angle. We extend our recent Cartesian slice-L+S method to develop a non-Cartesian slice-low-rank reconstruction model. DENSE data with MB=3 were acquired in 4 volunteers. The MB3+ DENSE method shows fewer artifacts than CAIPIRINHA and Hadamard encoding phase modulations. The slice-low-rank method with MB+ significantly improves slice separation providing fewer artifacts and signal decay.