DMAMUX experiment on stm32H7 with adc's and Gpio's

[SMour.1]

In one application I am currently developing I have a single pin for an adc input and an analog external mux(4051) on three pins that changes which of my actual 8 adc's is wired on this pin.I would like to iterate over the 8 different mux values and for every iteration I would like to read the adc value (so in 8 cycles I would read all the physical adcs).

I figured I can do that with dma's to offload my cpu so I want some thought's on how exactly I can achieve it.I have read the DMAMUX entry on the h7 reference manual but I am not really sure what I need from the DMAMUX to do. So what I did was :

1. Add a circular dma to the adc to trigger at every conversion .This step was done with the high level drivers of cubeMx and it is quite successful as I can read and print one adc value on my screen.
2. Enable the dma event request in the dma panel of cubeMx for the adc's dma (DMA1 stream 0)
3. Create a new dma request (DMA_GENERATOR_0) from the cubeMx panel on dma1_stream1 ,this request is Circular ,memory to peripheral ,whole world and on the dma request generator settings I put Request Signal :dma1 stream 0 and request number 1
4. Then on my main I created a table with size 8 that was setting the gpios to the binary values 0,1,2,...8 lets name it mux_val table
5. on my main I connected the dma with the table with the following lines

LL_DMA_SetDataLength(DMA1, LL_DMA_STREAM_1, 8); 
LL_DMA_SetMemoryAddress(DMA1, LL_DMA_STREAM_1, (uint32_t)mux_val);
LL_DMA_SetPeriphAddress(DMA1, LL_DMA_STREAM_1, (uint32_t)&MUX_GPIO_Port->BSRR);
LL_DMA_EnableStream(DMA1, LL_DMA_STREAM_1);

Note that for the dma I used the low level drivers as it seems simpler to me.

I had many issues with this which I overcome related to the accessible parts of memory by the DMA on h7.I even tested a dma request from a timer to update the gpios instead of the adc and it worked fine but it seems that something is missing from my dma configuration with the dma_generator instead of a normal request.

I am not quite sure that this is the way to go so I would like to discuss some alternatives(without hardware modifications). Also I would like an explaination on the differences between the cubemx configurations on DMA request Synchronization Settings and the DMa request generator settings and also what I need to correctly initialize the wiring of DMAMUX.How in general one would connect one dma request with two dma data transfers on an h7 even on the simplest cases ?

P.S I also did a similar question on https://electronics.stackexchange.com/questions/563947/dma-multiplexing-on-an-stm32h7?noredirect=1#comment1473163_563947