  We investigate the generation rate of quantum gravity induced entanglement of
masses(QGEM) in setup with multiple quantum massive particles, among of which
only the gravity interaction due to the Newton potential is taken into account.
When the distance between any two adjacent Stern-Gerlach (SG) devices is fixed,
we consider all the possible configurations of the setup with the same number
of particles. In particular, we systemically analyze the case of particle
number n=4 and find that the prism setup with a massive particle at the center
is the most efficient setup for the entanglement generation. This result can be
extended to a system with multiple particles up to seven, where the
entanglement efficiency is also enhanced in comparison with the setup with
fewer particles. This work provides the strategy to construct the QGEM setup
with the best generation rate of entanglement.
