Link to 90 degree risers:

https://www.aliexpress.com/item/PCI-1X-PCI-e-X1-Riser-90-Degree-Riser-Card-Adapter-to-USB-For-Riser-006/32838837305.html?spm=2114.search0104.3.102.13287ca4SicdbH&ws_ab_test=searchweb0_0,searchweb201602_2_10152_10151_10065_10344_10068_10130_10324_10342_10547_10325_10343_10546_10340_10548_10341_10545_10084_10083_10618_10307_5711212_10313_10059_10534_100031_10103_10627_10626_10624_10623_10622_10621_10620_5711313_5722413,searchweb201603_25,ppcSwitch_3&algo_expid=9bb19193-5030-4ec9-a35f-1c55b4f128f6-12&algo_pvid=9bb19193-5030-4ec9-a35f-1c55b4f128f6&transAbTest=ae803_5&priceBeautifyAB=0