Multi Gpu Hardware advice

I have a gigabyte ds3h v2 b450 motherboard. Currently hosting an RTX 3090 I have a spare 3070 and I wondered, can I run both? Got myself a riser cable and… Top slot card, bottom slot riser = card pushes the riser, doesn’t fit Top slot riser, bottom slot card = card pushes the sata cables doesn’t fit… So I either need another riser and put both gpus out of the case, or an atx motherboard with more space in between the slots or maybe I should look for another solution. I’ve read some of you are using nvme? How does that work?