Dual gpu build

Hi

I need help to build my dual-gpu worstation , here is the stuff i already have.
-RTX 3060 Ti
-RTX 3070
-Ryzen 5950x
-Ssd mvme M.2 gen 4 2to X2

  • MSI MPG GUNGIR 100P
    -64gb 3200mhz ram
    -Noctua i always forget their name, cpu cooler.

What motherboard and psu could i possibly get to get this running? (I am not looking for super high end premium stuff )

https://geizhals.de/gigabyte-x570-aorus-master-a2078160.html?hloc=at&hloc=de OR
a cheaper alternative https://geizhals.de/gigabyte-x570-aorus-ultra-a2078169.html?hloc=at&hloc=de

For the PSU, https://geizhals.de/corsair-hx-series-hx1200-80-plus-platinum-1200w-atx-2-4-cp-9020140-a1558691.html?hloc=at&hloc=de or a cheaper one with only 5 years of warranty
https://geizhals.de/be-quiet-straight-power-11-platinum-1200w-atx-2-51-bn310-a2204490.html?hloc=at&hloc=de