Do all the GPU's need to be same brand/model?

Looking to build out a 6 to 8 GPU 3060-ti rig (Hive OS) but will start with 1 or 2 GPU’s then buy more as they become available. Question is… do they all need to be the same brand and model?

Thanks for any help!

They do not need to be the same. Any gpu that can mine can mine next to another cards.