Dell EMC ME5024 Raid advice needed

I need some advice on the allocation of disks in our new Dell EMC ME5024 storage array

- 20x 7.68 TB SAS ISE SSD, read optimized, 12 Gbit/s 512e

It is accessed by 3 vSphere servers via iSCSI 10GbE (about 130 VMs).

I looked again in our offer and saw that our account executive offered us the storage with the following configuration:

20x 7.68TB SSD ADAPT(8+2)  110.59TB Usable  120K IOPS

Now I have read the manual and best practice and everywhere it says that you should split on both controllers.
Since we have 20 SSD we can't set up an ADAPT raid except maybe 12x ADAPT and 8x RAID6.

Would it be better to have 20x ADAPT in POOL A or should I rather have
10x RAID6 POOL A and 10x RAID6 POOL B.

The performance loss when using only one controller would then be about 50%, right?

Cheers