Using ADC3 when ADC 1 & 2 are running in DMA

I am successfully using a timer and DMA to capture 4096 samples from ADCs 1 & 2 using a master slave configuration on a STM32H747- Disco board.

I would really like to simultaneously capture 3 channels. Is it possible to capture samples from ADC 3 using the same timer & DMA concurrently with ADC1 & 2 running in master slave? I realize there might be a slight timing difference.