Building a Blender Desktop

Around Jan 2022 or so, I will buy a new Desktop with a focus on Blender and Unreal Engine 4 and 5 rendering. I am thinking getting of the following hardware.

AMD Ryzen 9 3900X CPU, 12 Cores, 24 Threads @ 3.8 GHz
RAM: G.SKILL Ripjaws V Series 16GB (2 x 8GB, PC4 32000)
or G.SKILL Ripjaws V Series 128GB (4 x 32GB) 288-Pin DDR4 SDRAM 4000 (PC4 32000)

Mobo: MSI Creator TRX40 (comes with eight RAM slots)
GPU: GeForce RTX 3060 (12 GB) or a pair of GTX 1080 Ti (2 x 11 GB SLI/Crossfire)

Does Blender support pairs of GPUs when Cycles or Eevee renders ?