We present an experimental study of the magnetic structure and dynamics of two frustrated hyperkagome compounds, Gd₃Ga₅O₁₂ and Gd₃Al₅O₁₂. It has previously been shown that Gd₃Ga₅O₁₂ exhibits long-range correlations of multipolar directors that are formed from antiferromagnetic spins on loops of ten ions. Using neutron diffraction and reverse Monte Carlo simulations we prove the existence of similar magnetic correlations in Gd₃Al₅O₁₂, showing the ubiquity of these complex structures in frustrated hyperkagome materials. Using inelastic neutron scattering we shed further light on the director state and the associated low-lying magnetic excitations. In addition, we have measured quasielastic dynamics that show evidence of spin diffusion. Finally, we present AC susceptibility measurements on both Gd₃Ga₅O₁₂ and Gd₃Al₅O₁₂, revealing a large difference in the low-frequency dynamics between the two otherwise similar compounds.